I got question, I have a 29gallon tank. When I started it I had 2 betta's and 2 guppies. After about a week or so, the 2 betta's died but the guppies are still there. Today, I got an algae eater and put it in the tank. After a couple hours i decided to check on the fish and noticed that the algae eater was upside down but breathing, i have since moved him to a bowl where it kinda looks like he's getting better. Any idea's on whats happening? Also, before the 2 betta's died, there were some bubbles coming from the filter but when the bubbles slowed/disappered thats when they died.....