Hello, just joined here. I've had a 10 gallon tank established for about 3 months. I had 3 fish and a pleco in there until just before Thanksgiving, when the 3 slowly died off one by one. I think this was my fault, as the filter was in bad condition. Bad fish owner.
Left the tank alone about until last week. 3 days before New Years Day we bought 4 fish. A dalmation molly, 2 red wag platties, and another small platty, cant remember the name. On New Years eve, one of the Red Wag platties died. All of a sudden. Went NY day and bought 2 to replace him (they are my sons' fish and they were very sad). Cant remember the names of these (they were the same) but they were compatible with the other fish. This past Wednesday, the small platty died. I went yesterday (Thursday) to replace him before my son saw him. I also had the fish store test my water and they said it was perfect. Last night my dalmation molly died. Suddenly. He was fine then he was dead. And he sank to the bottom...is that weird? About an hour later the one I had bought that am (sunburst platy I think it is) died. Woke up this morning...one of the two we bought New Years day was dead. Home from work this evening...other 2, dead. Pleco is the only one still standing. 6 dead fish in 24 hrs.
I'm so sad about this. I feel horrible!! They all looked fine and the water is fine. Any ideas what happened?
FYI...they did all come from the same pet store....except the pleco.
Thanks in advance for any advice. Also, I bought a fancy water tester tonight and checked the water myself using the test tube kit. Everything seems good--pH a little high @ 8.2, ammonia 0.25, nitrite 0, and nitrate 10.