That has happened to me and I sure hope it never happens again! I pulled and replanted a bunch of stems and stirred up debris stuck to the plants. The water flow wasn't enough to knock it off and boom, loads of extremely ugly algae. I check plants a couple hours after messing around in the tank now and knock debris off plants and clean my foam prefilter if it gets gunky, even do another water change/vacuum the bottom of the tank if it is really messy.
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