I have had my 29g tank for 1 year now and had 5 frogs to start with along with some fish. They all lived for about 6 months and then started dying until I had only 1 left. They didn't all die at the same time, it was a gradual thing. I think 2 died of starvation because they were very skinny toward the end, and I used to have shark catfish who used to eat everything very fast and wouldn't give others a chance to eat. I gave my catfish away after the 2nd skinny frog died, so I thought the remaining 2 should be okay. Oh, first died when the catfish knocked the end part of the filter and got sucked into the filter system. Well, the 4th frog died about a month ago, so after I did water change I went out and got 3 more. 2 of those 3 died. I did check the water and the nitrate was really high, so I cleaned the tank again and waited about 1 week and tested the water and went out and got 2 more frogs. I just found one dead this morning. I can't figure out what is going on. I just checked my water again, and it seems the nitrate level is going up again. I just did water changed about 1 week ago and water was just fine when I went out to get the frogs. Could the nitrate level be killing these frogs? Any advise would be appreciated.


