I just started my tank, 11 days ago. The first day I just ran the filter and bubble thing all day just to let the water stabilize.
The second day I added 2 fish: a black molly and a dalmatian molly. The black molly was very shy
and would hide behind things, but the dalmatian molly was not shy, would proudly show off his rather larger dorsal fin, and aggressive during feeding time.
After 7 days both were doing great, so I added 2 neon tetras, 1 silver dollar, and 1 plecostomus. All the fish were doing well. The temperature was hovering between 74-76F. No problems. The dalmatian molly was also the largest of all these fish and appeared to be by far the healthiest.
Day 10, I get up in the am. All the fish are fine. Come home and my dalmatian molly looks dead.
His body is wrapped around the filter intake. I turn the filter off and he is still breathing. I note the water temperature is almost 80F. The other fish seem fine. But I can't run the filter because he gets drawn right back into the intake. So I remove some of the aquarium water and put into a bowl, then I put him in the bowl to isolate him from the other fish.
He did not make it through the night.
Day 11. I did a postmortem on my molly. His death appears to be trauma induced.
What could cause trauma to a little fish?
Also where can I buy a water test kit? I don't want the pater strips I want the liquid chemicals and primarily want to test for PH, ammonia, nitrite, and nitrates, maybe water hardness.
Any advice would be appreciated.