Algae?

[Smithtim31]

Pretty new to the salt water world any help on what is this and how to make it go bye

 

[mdb_talon]

That looks like cyanobacteria to me but kind of hard to tell. Looks like only fish in there. I would suck up as much as you can, do a large waterchange, and turn off lights a few days, and add more flow to tank. Chemiclean can eliminate it also.

In any case it will come back without eliminating the cause(usually related to too high nitrates/phosphates, too little flow, and/or too long of photoperiod