Okay, its about 22 gallons, ph is 7.4, ammonia, nitrates and nitrites are 0. I have two angel fish, 4 penguin tetras, 7 black phantom tetras, 4 neon tetras, 3 guppies and 2 ottos. The angel fish are small though and i have checked to see if it is overstocked, but i havent added fish for 3 or 4 months. I noticed the guppies tail fins were almost as if they were ripped, i guessed it must be ich. 2 weeks ago i treated an algae bloom, but to no avail. Last night i used a bit of elbow grease and got rid of it all, is this the problem? All the fish are swimming funny, going on their sides, sinking, floating e.t.c, i didn't think i could have an outbreak of swim bladder, but they all seem to just be out of it. It could be stress, but would this cause them to be like this 24 hours on. No more have died, yet, but none are swimming normally. Any other questions you need to ask, please ask, and is there anything i can do?