I have a well-established 55-gal bowfront reef aquarium with very limited under-cabinet space. Would like to replace my old two-stage canister filter with something less nitrate-friendly, but... space. This is essentially an AIO setup - no sump or refugium. Appreciate any "small-but-mighty" filter recommendations - or even advice in replumbing this to make it all fit in a 8x30x24 high cabinet. Thanks.