I just set up my 29 gallon freshwater tank again and some neons i recently bought have been slowly dying. I had the tank set up a long time ago and then became bored with it and just let it go. About 2 weeks ago i cleaned it out and took all but about 10% of the water out....it was EXTREMELY dirty. I got some neons about 4 days ago and everyday i find 1 or 2 more are dead. Today I did a nitrate, nitrite, and ph test. The nitrate and nitrite tests showed nothing at all but the ph showed between an 8.5 and 9.5. The tests were kinda old though. I also noticed last night that i had completely forgot to plug my heater back in so the water was at about 71 degrees.
All i really want is to figure out what is wrong so i can get a green spotted puffer....i dont care much for the neons. I also want to get a freshwater lionfish. Could the 2 of these live togther in a 29 gallon tank? The lionfish will only be 2-4 inches on arrival....i'd really appreciate any help...thanks!