u/snailcream

I had one angelfish and 7 corydoras. I changed the water right before leaving and placed one of these in the tank. When I got home the smell was really bad and I found him :( I’ve now changed the water and checked pH and it’s all fine and the corys are all fine. I’m assuming it was the block but I wanted to check if there could’ve been other causes. I’m really devastated and shocked he died so suddenly I’ve had him for 2 years no issues. He was a red devil angelfish if that makes a difference. I have an 100L planted tank. I want to get new fish because it’s really depressing seeing my empty tank (probably wont be an angel again) but I’m scared of them also dying. So I wanted some insight. Thank you.