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With your open scapings, u can keep up to 4 or 5 tangs depending on the species and size of tangs u buy. Tangs are well known for their ich (marine whitespots) problem and many reefers who spends thousands on their setups were beaten by this dreaded marine disease that usually come along with your favourite genus of fish, Tangs. You have a beautiful setup but if u dun plan carefully on your choice and rate of stocking you can be one of those unfortunate reefers who fell victim to ich. On the worst scenario you can be so beaten that you may even quit the hobby or shift completely to a FOWLR copper tank which will be an utter waste on such an expensive and beautiful setup. The regal blue tang is a v popular and common fish in our hobby especially after the show finding nemo. I'm sure u know well about the fish already, so i'll touch on other tangs instead. Three popular genus of tangs here: Zebrasoma, Acanthurus and Ctenochaetus. Among these three i recommend u AVOID acanthurus family at the beginning. It is the most troublesome genus and also the most difficult to keep alive. The tangs under this family are achilles tang, sohal tang, powder blue tang, atlantic blue tang and clown tang. They are beautiful and popular but are difficult and problematic as they succumb most easily to ich, especially achilles tang. So although u like them a lot, i would discourage u to try them. Maybe after one year when your tank is v stable and established, then i suggest u to try one in your tank and start with powder blue as it is cheaper and not as tough as the other two. And from there restrict yourself to one or two only to keep ich under control. My favourite is the zebrasoma family. They are colourful, hardy, stay smaller, easy to feed, and most important of all, least susceptible to ich compared to the other genus. The tangs included in this family are yellow tang, purple tang, scopas tang, black tang and gem tang. One thing to note is zebrasoma can be rather aggressive, especially purple tang. So if u can add them all at one go or use the betta box method. Not more than two to three zebrasoma tangs in your 4 ft is recommended. Lastly the Ctenochaetus (also called bristletooth) family is good for algae control. They are moderately hardy, easy to feed but grow up ugly. When they are smaller they are cute and colorful, but they quickly lose the cuteness and color at 3" and above. Luckily many bristletooth tangs are collected tiny, about and inch or slightly bigger. Some bristletooth includes the popular chevron tang, tomini tang and kole tang. If u buy them small, keeping two to three bristletooths in your 4ft is not an issue. Stocking slowly and wisely will keep ich under control.

Bro, any photo? Size?

This article from the breeders registry might be some use for you guys. water velocity over acros