I recently setup a 55gal saltwater tank and every fish I have put in it so far has died (3 damsels on 3 separate occasions). I believe the problem is mainly my own stupidity; I painted the tank on the outside and some of it did in fact get inside the tank, I used spray paint, because Home Depot told me it would adhere better to glass, but in retrospect maybe that wasn't the best idea. Anyways I went over the interior with a razor blade/window scraper when I did notice it and I'm pretty sure I got it all out. Since then I've put in about 60lbs of live sand and about 30lbs of live rock. The fish do fine for the first 4-5 days and then I find them lying on the bottom of the tank respirating, losing color and shortly thereafter they die. I had the tank mixed with the salt water for about a month with an Eheim 2215 Canister, AquaClear Powerfilter 500 and 2 Aquaclear Powerhead 50s. The temperature is constant between 77-79, ph is 8.3, ammonia, nitrate, nitrite all registered 0 during any tests I have ever done, gravity is 1.025. I've done about 3 30% water changes over the past few weeks. There are a few snails I've noticed on the live rock and also a decent sized crab in one that have been in the tank since the start and they seem to be doing fine. I also have a Current USA Satellite Dual 1016 light that I leave on for 10-12 hours a day. I should also mention that I feed the fish 3 times a day sparingly and they eat everything fine up to their demise. So I think thats everything....what should I do? Is there someway I can clean the tank, I read some stuff about a mild bleach solution to clean the tank, but haven't come across anything that sounded too certain...Or could it be something else I am overlooking other than contamination? I'm pretty sure it's not my tap water I use it all the time in my freshwater tank and I've never had any problems, and I always use stress coat in new water anyways and age it for a week or so. Any advice would be greatly appreciated.