Since you don't have very many, the easiest way to control it is to just siphon as many as you can out when you do a wc. Don't let it get to the extremity mine was cuz siphoning didnt do anything since there were so many. I ended up having to use flatworm exit. It's safe for fish and corals but the flatworms release a toxin when they die so I had to do a massive wc afterwards but I still lost a fish bc of it
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