biofilm

Hey everyone — I’m looking for some guidance or opinions on what may have caused the sudden loss of my cardinalfish in my 20g reef tank. This was my first fish loss, and I’m trying to learn from it so it doesn’t happen again. Tank Overview (Pre-Incident Setup): 20g saltwater tank, running for...

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...