i also have algae issues in my brackish tanks, but only green algae (my freshwater tanks have none). I bought 10 olive nerite snails (i think from mgamer), and put them in my 10g. they work amazingly well. but when i tried to move them up to my 75g with my large fish, if the snails are on gravel, they all simply get bowled over from the turbulence of fish swimming by, so i moved them back to the 10g. so now i rotate the algae covered decorations from the 75g to the 10g, let the snails scour them (it's amazing how thorough they are), and put them back. the glass is going to need scraping. my nerites have doubled in size from very small pea to large pea, but unless they get really big, i think this is the best i can do.