So I had the old red slime a while back and got rid it it with red slime remover. Now its back but only in the low flow areas. I've been checking all my water parameters and everything is good. Nitrates wad just a tag high but I did a water change yesterday with ro /di water. Could it just be that I need more flow around my rock work?? I'm pretty sure u could use another powerhead but what else could really be causing it?