helpful ideas on building my 630 gallon system

[j.p. harrington]

o.k. so here it gos i just am wanting some ideas before i even start so here is my basic concept so far

220g DT

(2) 26g sumps bought off of ebay skimmers and all claims up to 450g

55g refugium

55g octopus tank

55g seahorse and pipefish tank

(4) 55g barrels for more water and filtration

i was mainly wondering what would you put in the barrels im thinking i mean can i just feel them with like base rock and have like 4 huge natural filters or what and info about any of this would be appreciated