So my 75 gallon is now fishless due to the ich outbreak. They are being treated in qt. But I now have noticed that I have a lot of bristle worms. Like a lot. They are even coming out in the day and climbing on the glass. I understand they are beneficial, but how many is to much? I’m assuming my dotty had them under control. But do I need to add an arrow crab? Or just let it ride?