My old system I went over a year with out a water change ... new one has been up and running sense Sept and only did the first one a couple weeks back .. depends on the BIO load ... how many fish how often and how much you feed, water volume, and filtration .. mechanical .. or natural... and what you have for a clean up crew, if you have Macro Algae ...many different factors ...
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72g Bowfront Drilled,Lighting,2x250 10,000k MH,2 actinic T5,2/6" fans,2MJ with 1600gph convertions kits,Bullet 2 style skimmer with Mak 4,29g sump/Refugium,96W power compacts in sump, Velocity T4 Titanium "return",Life Guard 300 Fluidize bed filter,1"sand bed, 29g auto top off, 140lb LR,SPS,LPS,Softies,Zoos,2Percula Clowns, 2yellow tail Damsels,1yellow tang,2cleaner shrimp, 1six line Wrass,2 Bengaii Cardinal,1lawnmower Blenny,1sand sifting star,1TigerTailCucumber, snails,hermit crabs,Macros.
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