Hi everyone! A while ago I started up a planted shrimp tank and all was going well! Then, we added 8 Mosquito Rasboras, a few more shrimp, and some of those floater plants. Keep in mind that this tank was well cycled, and I had tested the water a couple times before and everything was good. But then everyone started dying, one by one! Every night either a shrimp or a fish was found dead, and it got so bad that I'm left with only 2 rasboras (which I feel so bad about since they're schooling fish). During this I got my water tested and the people are the aquarium store said it was totally fine, and they were probably just dying from the stress of moving, but all this happened a week after bringing the fish in, plus the shrimp had no reason for dying.
Basically, we had no idea what happened. The only thing we can think of was that we had a couple little clay decorations with glaze on it and think maybe the glaze dissolved into the water? But even then it's weird because they had been in the tank since day 1. Either way, we took them out. It's been about two months since this happened, and the two rasboras are seemingly doing well (same with the snail that must've come in on a plant unfortunately). I've been doing mostly regular water changes, a little off since I was travelling for a month and had a friend watch the tank.
I was wondering if anyone had any advice on when we can bring some new life into the tank. I'd love to get some more rasboras so have a school again for the two survivors, but I definitely don't want to get more if they'll just die again. I'm not sure why only the two of them lived, either. Plus, it was originally just a shrimp tank and I'd love to have shrimp again!
Any thoughts? Thanks!!