I have a 24 gallon JBJ Nano cube which I purchased used on Craigslist. I've been reading, researching and asking questions for about 2 months before I found the tank. I need to know if I've done the right thing here. The unit came with the standard bio balls, ceramic rings and charcoal pellets. I started the filtration system in the tank with this material. In reading many posts on many sites I've decided to take it all out and now the only thing I have is poly fill, which I change every other day. My levels are great; 0 ammonia, 8.3H, 1.025 SG, Nitrite 0 and nitrate 10. I also have nice caroline algae on most of the ricks and green algae growing on the glass. I think my levels are stable because I seeded the tank with 50%water and 100% live rock (20lbs) from an established tank. I've got star fish, hermits and 1 snail that came with the rocks and 1 damsel and 1 Maroon clown that were given to me with the water and rock. All are doing great, but it's only been 2 weeks and I'm concerned that there will be a drastic change down the line somewhere. I test the water every day. I have made 2-20% water changes because I had 0.25 ammonia. Is there anything else that I should be doing? Should anything else go into this filtration system? I've just ordered a protein skimmer made by JBJ specifically for this tank. Should I hook up the skimmer as soon as I get it or do I wait? I want this to be a reef tank so I have to get everything perfect.