Kohl's tangs are about the smallest of the regularly available species, and they top out around 7". Others can go over a foot, some to 2 feet or more. A decent entry level skimmer to the BakPak, for your comparison, is the AquaC Remora. Anything less expensive than these, while attractive, are not likely to be worth it. Every time I've gone looking for rock, Drs. Foster & Smith (liveaquaria.com) always comes out to be the least expensive, with shipping. You can probably get a box (45lbs., standard) of Walt Smith Fiji rock for around $150, shipped. Tampa Bay Saltwater might be cheaper per pound, but it's a denser rock, that often turns out to be more expensive per volume. I'd personally rather have the more open Fiji rock anyway. If you're not planning on going with a deep sand bed, the HOB filter won't be enough, IMO. If I were to do a 55 in this fashion, I'd want at least an Eheim 2026 (or comparable) canister. You will, as well, need more circulation than the filters alone can provide. Powerheads can accomplish this inexpenisvely enough. I'd go for 2-4 PHs in the 200-300gph range.
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