Quim
Aquarium Advice Apprentice
I need help. Yesterday I cleaned the sand in my 20g and did a water change after a 4 hour power outage in which 3 hours in I went and got a battery operated air pump. After the change I noticed 5 of my golden zebra danios were hanging at the top not moving and 1 was laying at the bottom rarely moving. The temp in my tank stayed around 75 during the power outage. Today I found the one at the bottom dead. I also noticed 3 pond snails that seemed dead before my water change so that and the power outage convinced me to do a water change and test everything. My perimeters are 7.6ph, 0 ammonia, 0 NO2, 20 NO3, 0 copper, 7 kh, 8 gh. I use API liquid test kit. I have a steady temp around 76. It's a 20g high with only 6 now 5 golden zebra danios that have been in there since I completed my fish less cycle 3 weeks ago. I have a Marimo moss ball and sand as a substrate. Please help. I was planning on adding my next group of fish since everything had been going well for 3 weeks. The dead fish looks normal, no white spots or anything that I could see.
