Good for your tank. They like sumps and fuges because they're filter feeders and that's where at the nutrients end up. I also think they like places with lower lights.
Mine come and go in cycles. Sometime I'll have thousands covering the glass in my fuge and then their population drops to only a few hundred and then they come back again. Strange.
Mine come and go in cycles. Sometime I'll have thousands covering the glass in my fuge and then their population drops to only a few hundred and then they come back again. Strange.