I forgot all about this thread. I now have a 30gal. and I haven't had any trouble with it yet. The water has been clear. I stopped using EasyBalance. I now use a little aquarium salt and have had to use Melafix a couple times. I did lose two fish, one recently and the first one I lost because it jumped out of the water when I was transfering it from the old tank to the new tank, I did manage to keep him alive for a while after that, but between that and the new tank, he wasn't able to recover. I now have four Giant Danios and they seem healthy.