As far as the Hs crab I have a 220 I can't afford to set up yet in the garage that probably wont be bid enough either with live rock so when they get that big I will have to donate od something.I was thinking 220 would be big enough until second look. So I have a few years until they outgrow me. Derasa clams don't need as much as others from what I have read and I changed the light to a Reef sun bulb 50/50combo actinic 420 phosphor 6500k trichromatic daylight phosphor. If that is not good enough please let me know. also got reef test kits for calcium and such. I am using live sand which after this post I will be going to buy more today so I can start raising it up. I just started using the instant ocean nitrate reducer last week still waiting for results. Unfortunately I am still using tap water but will be switching to either distilled or ro purifier soon. just had a daughter and wife is just starting back to work. I will start feeding less , and hopefully get some lower readings soon thanks for all the help.