Hello everyone. I'm new to this and just set up a 20 gallon FOWLR tank which is in the fishless pure ammonia cycling process. I have a conern though. A friend of mine gave me a small piece of rock or dead coral to help me cycle the tank. I put it in and overnight, a ton of these little white critters started to show up on my glass. They are tiny. Are they parasites? Are they bad? Cool enough the dead coral has one small polyp on it. Will it make it through the cycle? Please help.