DavidR Posted September 1, 2021 Share Posted September 1, 2021 It started about two months ago. I had 4 fish that had been in the aquarium pass, I'm unsure why. They were all rainbow fish, I have otto's and lots of shrimp that didn't seem affected at all. 2 of the rainbows did survive and actually seemed to thrive. I checked parameters and had no ammonia or nirtrite with minimal nitrate present. Fast forward to now, I watched the tank for a couple months and checked the parameters. No ammonia or nitrite appeared. I added 10 small rainbows after it seemed the tank was stable. All but two of them have passed over the week they have been in the tank. No other residents have had any issues. Again, I checked the parameters and noted no ammonia or nitrite and minimal nitrate. This is a 78 gallon heavily planted tank that has been running for over a year. I have a bunch of cherry shrimp and 6 otto's in addition to the fish mentioned above. I'm confused as to what could be going on, any help is appreciated. Link to comment Share on other sites More sharing options...
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