Algae or ??

[lance]

Wondering if anyone can identify the "algae" in the pics? The red is on some "old-school" coral skeleton. I was told it could be from poor water flow, so just redirected the returns..

The spider web looking stuff is on some live rock. Not sure if its the same white fungus as [r20crazy] has? The tank has only live sand/rock and two fish.

Thanks in advance.

lance
75gal, cycle (+) 3-weeks

 

[miket]

pink/red stuff on the coral skeleton is cyanobacteria, it can be due to low flow, but also nutrient buildup in the water, as well as having the salinity out of range.

The second pic (the white stuff) looks like a sponge. Harmless filter feeder.

- MikeT