Extra Filtration for 28 Gallon JBJ Nano

[chromakey]

Here are some pics of my tank:

I have some cyano bacteria on the green algae for sure. I try to suck it up when I do my water changes. I have some other reddish algae? that is growing on the coral. The texture seems different and you can't remove it with the turkey baster. Is this something else?

I am at the max for fish and that is kind of why I was thinking of adding some more filtration.

I have 1 adult clown, 3 juvenile clowns (locally bred in Victoria), file fish, 2 cleaner shrimp, 1 6 line wrasse and snails & crabs.

Thanks,
Michael