please look at these 3 things growing in my 36gallon. Water parameters are good.
1-red algae?2-light blue tube thingy 3-Smokey veil covering and swaying off the live rock. 5 months old.
2 clowns,1 dottyback,2gobies,1 coral beauty,2 chromes.
Looks like cyano bacteria to me. What are your parameters? Usually it shows up from high phosphate. You can try running gfo or other phosphate media. I think people also use stuff like chemiclean but i've never used it. You should also look into the causes, usually feeding and / or source water quality are the cause. Its also pretty common in newly setup systems as things take time to become balanced.