So, I'm going to claim myself as a newbie. I've had a tank for a long time, but just starting up again. I just replaced my homemade sump and old skimmer with Trigger Systems Emerald 26 and AquaMaxx FC-120. Very happy with the results. Currently stocked with a a yellow tang, a clownfish, a big cardinal fish, a black and white damsel (who survived the bad days when I wasn't taking proper care of the tank), a six-line wrasse, a orange spotted blenny, an emerald crab, and three shrimp (a fire shrimp, a peppermint shrimp, and a scarlet skunk cleaner Shrimp), plus a bunch of snails and a few hermit crabs. Everything is going well, with two exceptions: I have some red algae on the sand bed and fuzzy brown stuff all over the live rock (pics attached). I think the brown stuff is diatoms, but I'm not sure. Would more emerald crabs take care of it? And what about the red algae? Thanks in advance for your help.