biofilm

trying to solve this problem and it will not go away. Nero 3 wave maker added RFG Added. (Both pointing to surface) Sump modification. Overflow modification. NOTHING WILL SKIM THIS SURFACE! overflow is working as it should.

so I’ve had this tank over a year. Always struggled keeping coral and maintaining water quality. it’s only 60L and exactly the same as the Fluval Evo except slightly taller + a filter grid at bottom (see pic) I’ve noticed a surface biofilm problem despite good agitation, and my filter floss on...

When I turned flow oftoday to feed acans, I noticed a slick film on the surface and a few bubbles caught under it. It’s a bit harder to notice with the flow on. I have both return bills and wavemaker pointed at surface for agitation and a Nero 3 on the way. Is this normal ?

I've had this film/tubey structure encasing this rock for at least a year now, and I'm beginning to get curious of what it is. When I removed the rock from the water when transferring tanks in July, the film felt slimey but did not readily brush off. It seems to be inflated almost like a halo...