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I bought 4 white guppies for a new lightly planted tank. They where all male. I’m not new the fish scene. I have had lots of tanks for being 17. Around 10 total. 5 right now including a saltwater. I know about the nitrogen cycle, and I let this tank cycle for months. The ammonia levels where 0, added the fish and they went up a tiny bit. I use the API Test kit. 3 of the guppies slowly died. So now I have 1. I thought maybe the flow was to high, I’m using the marina slI'm s10. It’s a 7.5 gallon rimless, and the flow looked about the same I would use for a betta. I looked at the remaining guppies fin, and they got shredded over night. Maybe the fish didn’t get along? I don’t want to lose this last one, does anyone know why. The tank is always between 74-76 F. Why did I lose 3 of them? There is a little bit of tannins from the drift wood in the tank, so it’s slightly yellow, could the PH make them suffer?