If this is your first fish you are introducing to your tank go with the Green Cromis they are cheep so if you have a problem with your tank your not throwing much money away. I have 4 in my tank 2 larger ones and 2 smaller ones both sets introduced at differnt times. Thay all get along with one another as well they do fine with the other fish in the tank. Just my opinion.
Cheers 
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72g Bowfront Drilled,Lighting,2x250 10,000k MH,2 actinic T5,2/6" fans,2MJ with 1600gph convertions kits,Bullet 2 style skimmer with Mak 4,29g sump/Refugium,96W power compacts in sump, Velocity T4 Titanium "return",Life Guard 300 Fluidize bed filter,1"sand bed, 29g auto top off, 140lb LR,SPS,LPS,Softies,Zoos,2Percula Clowns, 2yellow tail Damsels,1yellow tang,2cleaner shrimp, 1six line Wrass,2 Bengaii Cardinal,1lawnmower Blenny,1sand sifting star,1TigerTailCucumber, snails,hermit crabs,Macros.
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