HOW BIG OF A DT DO I NEED?

[Gator0930]

http://www.glasscages.com/?sAction=OrderForm&sProdID=AQ_300Wide - tank?
https://www.bulkreefsupply.com/regal-300sss-12-space-saving-protein-skimmer-varios-reef-octopus.html - 1 skimmer

 

[Gator0930]

can all 3 or a combination of the three coexist
kole tang
tomini tang
white tail bristle tooth tang

 

[Gator0930]

http://www.glasscages.com/?sAction=OrderForm&sProdID=AQ_125Wide - sump
standard 20 tall for ato reservoir - is this big enough?

 

[Gator0930]

You've got a 15" adult sized Tang on there... plus a 2nd smaller tang, some larger highly mobile wrasses...

I'd say 200 gallon, minimum. Something along the lines of a 7x2x2 220g tank would probably be suitable, and can be had at a fairly reasonable cost. Might recommend an upgrade on that 200SSS skimmer. IMHO, it's a bit small for the tank you're planning.

As for bottom feeders, I really like my bi-color goatfish. Constantly sifting the surface layer of sand, without making a true mess like so many sand sifting fishes do.

I've had several fighting conchs over the years. I have sand tiger conchs now, and like them much better. They're much more active, moving around the tank a lot more than the fighting conchs ever did. The two tangs themselves can certainly be included in the CUC... they're far better algae eaters than most any snail you might consider. A few Nassarius help a lot to keep the sand bed clean.

Do you have smaller fish like small wrasses, jawfish, and gobies in with your bicolor? I have heard they can be an issue with these. Also, do you have any experience with the Pacific Redstripe Hogfish?