I have a 36 gallon freshwater aquarium started a year ago with 6 glofish, 1 3Ē gold gourami, 1 2Ē catfish algae eater and now down to 4 from 6 guppies.
Filter type marineland Bio-wheel penguin 200
Current water parameters are:
Nitrate 20 (how could it possibly be if no ammonia has been detected?)
Last gravel vacuum and 25% water change 4 days ago.
Generally 25% water change every 10 days and gravel vacuum twice a week.
Feeding them once a day in the morning with TetraMin Tropical Crisps, alternated with Omega One freshwater flakes and randomly with Api Tropical mini pellets.
We have some serious problems with our guppies added a couple of weeks ago, bought from PetSmart. One of them, female, had a large tummy so we assumed she was pregnant and prepared a nursing floating tank for the delivery. They were doing very well, all of them, they were playful and swimming together. A few days ago suddenly I just found one blue guppy dead without back fin.. immediately I thought he had been attached. That same night I put the female inside the floating tank. In the morning when I freed her I noticed her back fin was torn. But she was all alone so she couldnít be nipped by no one. In a day or so her fin slowly got worse and this morning I found her dead and the back fin completely gone. Now a third guppy is in a critical condition. His tummy got bloated but I canít really see pine cones like skin to think of dropsy. His back fin also got some tears. A forth one now is just still at the water surface. The last two seem swimming and eating ok and the other fish too.
Any expert advice to try to save them and to understand why and whatís possibly going on with them?