well i do and from the start used R/O water from the grocery store, since my tank supposedly12 gallon would hold only 9 before i added sand and rock, i test my tanks outside first! I guess i might try he 30 dollar skimmer, if it just does a little that good enough. I already have a 55gallon with some VERY nice cichlids and I cannot have any more big tanks. so i am going nano with a reef and dont worry about so much cost as size. so with that in mind i guess I am trying to put an extrordanary amount of effort into keeping the water polished and very high in quality, no matter what especially that it isnt harder to to keep nano's than larger, just needs more precision in the water care.