Your large return pump is connected to or sits in your sump. Your refugium is part of your sump. Your skimmer also sits in a chamber of your sump. Your ATO will have a pump that feeds water up to the sump. You basically have 3 pumps: the little one feeding the ATO system, the one inside your skimmer driving its bubbles, and your big return pump. You'll also find a 'mixing pump' useful to hasten salt water production: a small Tunze is good for that.
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Sk8r
Salinity 1.024-6; alkalinity 8.3-9.3 on KH scale; calcium 420; magnesium 1300, temp 78-80, nitrate .2. Ammonia 0. No filters: lps tank. Alk and cal won't rise if mg is low.
Current Tank Info: 105g AquaVim wedge, yellow tang, sailfin blenny,royal gramma, ocellaris clown pair, yellow watchman, 100 microceriths, 25 tiny hermits, a 4" conch, 1" nassarius, recovering from 2 year hiatus with daily water change of 10%.
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