Jump to content


President Emeritus
  • Content Count

  • Joined

  • Last visited

1 Follower

About Origami

  • Rank
    President Emeritus
  • Birthday 11/21/1960

Custom Fields

  • Gender
  • Location
    SW of Leesburg, S of Hamilton, VA
  • Interests
    Scuba, reefkeeping

Recent Profile Visitors

3,826 profile views
  1. Origami

    Snack time

    Great video, Warren! Paul B often talks about feeding his fish little neck clams, too. He talks of freezing them and shaving off pieces with a razor, though. I'll bet your fish came away from this meal fat and happy.
  2. Origami

    what flow rate 36w uv?

    Here's a little souvenir of the milestone:
  3. Origami

    Forum Images

  4. Really? That long? That's incredible. Maybe something else has settled on the old skeleton, then. It's worth watching. It's just one of the things that makes this hobby so interesting. Some friends in McLean had a purple & green plate coral that was dying some years ago and it started throwing out babies - many of them - as the mother coral gradually died off. I received one of the babies when it was about nickel-sized. Then, some months back, I suffered a heavy metal problem that started wiping things out. The plate coral, which by then had grown to 3 to 3.5" across started dying back. I thought it was gone but decided to leave the skeleton on the bottom just in case. Then, one day, I saw a small piece of tissue rising between a pair of septa. It gradually grew and, today, is about the size of a quarter and appears to still be attached to the old skeleton (though I've not tried to move or remove it). It seems happy enough right now, so I'll just let it continue to grow. In this case, though, only a few months had passed - not a few years. Keep us posted on it. If it's another fungia, it would be an awesome example of life hanging on.
  5. Yeah, they can surprise you that way. It doesn't take much living tissue to regenerate a completely new fungia.
  6. Weldon 16 can be used to fill gaps or build up a fillet. You may have to take several runs at it. But, it's a medium bodied cement that should have no issues with either the acrylic or PVC, and will give you a decent weld. The older Ebo-Jager heaters were better. Eheim-Jager slightly less, but still good.
  7. Origami

    New to WAMAS and DC

    Welcome to the club, Zac. I hope that you'll be able to join us at our next meeting (which is coming up next Saturday). Fifteen years is a good bit of experience. If you're visiting us using a regular browser, you'll see a tab near the top of the page that links to an LFS map. You can use that as a starting point to visit some of the stores near you.
  8. Origami

    Test results and what should I do

    I'm assuming that, by using API, that your alk is at 5 dKH (vice 5 meq/L). Correct? Because 5 dKH is low, versus 5 meq/L which is high. That's quite an imbalance between calcium and alkalinity? Are you dosing a calcium supplement. Do you trust that your test kits are giving you accurate results? Alk can be adjusted upward with baking soda - plain old Arm and Hammer works great. It won't affect other parameters (except pH). You can determine how much to use using a reef chemistry calculator like this one : http://reef.diesyst.com/chemcalc/chemcalc.html
  9. Origami

    Need help calculating salt usage...

    Unfortunately, no. Not for most of what I wrote. However, I'll often look up and use a salinity converter (such as the one here: https://www.hamzasreef.com/Contents/Calculators/SalinityConversion.php) But that just enables me easily go from sg to ppt for artificial saltwater. The rest of the calculations just follow by application of other knowledge.
  10. Origami

    Need help calculating salt usage...

    Oh, you asked about unskimmable organics. It pays to understand basically how a skimmer works first. A skimmer introduces millions of tiny bubbles to a body of saltwater. Each bubble has a boundary - what we'll call an air-water interface. It's the boundary between the air that's trapped in the bubble and the water that the bubble is floating in. Water itself is a polar molecule and that's a very important property when it comes to dissolving things. Now, we have lots of different kinds of organic molecules in the water. Some dissolve well in water - we call these water-loving or hydrophilic behavior. Others don't dissolve but instead repel water - we call those water fearing/avoiding or hydrophobic behavior. Some organic molecules, because of their structure, are hydrophobic, some are hydrophilic, and some are a combination of hydrophobic-and-hydrophilic. It's this last class of organic molecules that tend to be attracted to the air-water interface of the bubbles in the skimmer with their hydrophobic ends hiding inside the bubble and their hydrophilic tail pushed out into the water. The other stuff - especially the hydrophilic molecules have no special attraction to the bubbles, so they tend to stay behind in the tank water. These other organics often can be addressed using activated carbon or water changes. BTW, as these organics accumulate, your tank water begins to take on a yellow-cast. It's difficult to notice most of the time. However, if you tape a piece of white paper to one end of the aquarium and look at it from the other end of the tank, it'll look a bit yellowed (under white light) if the water is full of dissolved organics. The Germans call these yellowing organic compounds "gelbstoff" or yellow stuff.
  11. Origami

    Need help calculating salt usage...

    That's a lot of salinity drop. You must be skimming very wet to lose that much salt, or you have a bubble problem resulting in a lot of salt creep. Here's what I find strange: You have 100 gallons of saltwater. That's about 379 liters total with a total weight of around 387 kg. Now, you've given us a starting and ending salinity of 34.51 ppt (1.026 sg) and 30.55 ppt (1.023 sg). From these, I can calculate approximately how much salt you have in your water. At the starting salinity of 1.026, you have about 13.36 kg of salt in the tank. At 1.023 sg, it's closer to 11.58 kg. That's a drop of about 1.75 kg, or just under 4 pounds of salt. That's one heck of a lot of salt to lose in 2 weeks. To visualize that more clearly, it's the amount of salt that you'd find in a bit over 13 gallons of your water at it's starting salinity. In other words, neglecting salt creep as a method of export, you'd have to be losing upwards of 13 gallons of water through your skimmer or through some other leak over a two-week period. Another way to visualize it is to note that a cup of IO weighs around 0.6 pounds. Therefore, you're losing about 6.5 cups of salt over two weeks, or about a half cup a day. So, You've either got a big leak somewhere (unlikely, because a gallon a day of loss would probably be noticed). You've got a huge amount of salt creep that you're picking off and discarding - about a half-cup a day of dry salt. You're skimming really wet, exporting close to a gallon a day of skimmate. Or, of course, a combination of the above. Another option is that you're not calibrating your salinity measuring tool correctly. Your dosing approach will replace many trace elements. That's the good news. Over the long haul, though, any one of the two- and three-part systems will ultimately result in an ionic imbalance. For example, in basic two-dosing, you replace calcium and alkalinity using mostly calcium chloride and sodium bicarbonate (or sodium carbonate). You'll notice that, while dosing to replenish calcium and carbonate alkalinity, you're also adding sodium and chloride ions. Now sodium and chloride are in huge supply in your water, so the added amount is small relative to what's already there. But, over the long term, these small additions add up and can shift ionic balance. That's why, even in these sorts of systems, you want to perform an occasional, major water change.
  12. Origami

    Scoly ate my Nem...

    There you go. Members helping members, selflessly putting himself between you and disaster. The sacrifices we make sometimes.... Respect.
  13. I've liked Drew since he showed that the Chargers shouldn't have let him go way back when. Incredible competitor and undisputed first rounder. It's been a long time, but I was a devoted Chargers fan from the Air-Coryell / Dan Fouts era. Over the long-haul, though, going to New Orleans has worked incredibly well for him and the franchise. Good luck this weekend.
  14. Origami

    Grey Sch 40 conduit

    Nothing seems to preclude its use. The size and material is consistent with standard PVC used for plumbing. For drain use it should be fine.
  15. Origami

    Need help calculating salt usage...

    You may have a misconception about water changes and why they're done. Ideally, you don't do water changes to manage nitrates and phosphates. That's what your biological filtration (rocks, sand, clean up crew) are there to manage. We perform water changes to replenish inorganic trace elements that may not be otherwise replaced; to remove otherwise unskimmable (nonpolar organics) pollutants from the water; and to restore/manage ionic balance over the mid- to long-term. As for your salinity question, when you find a salinity imbalance, depending upon the size of your system, you can add saltwater to your sump when salinity is low above the ATO level, or substitute saltwater instead of fresh in your top off for whatever time is needed. Evaporation will continue to occur, gradually concentrating the total salt in the system and raising salinity until you reach your target level again. This approach is better than adding dry salt to your tank because, as it is, the dry salt mix is slightly caustic and, ideally, should be mixed a day or so in advance to allow the pH to stabilize and the newly mixed water to achieve balance with the surrounding air.