tangs
For tangs a minimum of 75gal is typically the recommended starting point for tank size. As for the algae eating end of things I believe all tangs are considered herbivores or omnivores so most do a fine job of eating algae. The other thing with tangs is... What goes in must come out. So in a smaller tank, if the fish (especially a tang) is eating lots it's going to be excreting lots. Up the bio load BIG TIME. In my experiance many people including myself tend to call the tangs the 'pigs' or 'dump trucks' of the tank...  If the rock that you have has hair algae you may want to consider taking the rock out and scrubbing it in a pail of saltwater. Thing is once you have the rock clean try changing something in your tank whether it's flow, lighting, ro,phosban,etc... If you don't make a change of some sort you may find you will end up with the same end result again(more hair algae). Anyways just my 2 or 3 cents.
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300 Gal 6x3x28 high Starphire peninsula w/external herbie/bean animal hybrid +150 Gal custom sump with 30gal fuge section, (both built by Concept Aquariums Calgary), 3x Ecotech Radion xr30w g2's(soon to be G3 Pros), Jebao DCT 12000 return pump, 2x Jebao RW 20 powerheads, Tunze Ato, Vertex ro/di, Reef Octopus Ext 200 skimmer run internally.
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