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Could be possible hard to see. You have fish in tank? The best way to keep them out of filter. I got old panty hoes cut and wrapped them around the filter. And tied with hair tie.
Planaria are often found in aquariums with uneaten food. The planaria won't hurt the fish, but they are a symptom of too much gravel containing too much uneaten food, and that is not good for fish. They require a food source, which means there must be excess food wastes in the tank to support them. They also feed on eggs. Not good for breeding tanks. Sorry really thought I saw something else