Just today I was searching around my tank from the outside, and noticed something move quickly but it was something small that I couldn’t see. I currently have 3 Cory fry that I can see/find and all are various ages. I have a very small fry that isn’t coloured up yet, one that is a bit bigger and has colour/just colluding up and one more that is a bit bigger than that one that is coloured up. But my question is, they are in my main tank...how do I go about cleaning it? These guys are so tiny! I wasn’t expecting to be a Gma! They obviously can grow in my main tank as there are various ages but anything special I need to do? I’ve attached pictures of all of them.