im not certain but i think they have to be introduced as pairs otherwise they fight. Unless you have a large tank.
Probably best to wait for someone who knows a little more than me 
good luck
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45g,Flat back five sided tank 24\" d. 50lbs lr, 35lbs ls. Magnum Can filter, 250w hqi m/h 10000k, 2 p/h 1200 & 400,brains, leathers, xelias, gs polyps, bubble, tons of critters hermits, snails,starfish, scallop, few fish and tons of algae
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