The Red slime is cyanobacteria. A pretty bacteria but one that will take over your whole tank if not taken care of. The best thing to do is get a Red Slime Remover at your LFS. It's inexpensive, but still works. Once I got mine, because i recently had a red slime attack, it wasd a powder subsatnce that you mix in the salt water in a cup then pour it in and it takes a few days to start working, and by the 5th day after, I was free of all cyano and hadn't seen it since.
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