So this is a little embarrassing. I’ve been around the hobby my entire life because my dad owns a fish store. I’ve started numerous tanks with him but when I start my own…disaster. I Cycled the tank and had two clowns in it. Everything was going fine and then bam brook or velvet wiped it out. I know the fish didn’t have it at the store because I know where they came from. At that point I let the tank fallow for 6 weeks to wipe out brook if that was it and when I restarted it happened again so I believe it was velvet. At that point I was like I’m gonna completely restart. Drained the tank for 2 weeks, let the rock dry out, and new sand. Fast forward 2 more weeks and the clowns have it again. I’ve determined it’s an outside factor but I can’t figure out what it could be. Help