I do a waterchange when my tank tells me. It's my GSP of all things that tell me when it's time. When it retracts, and doesn't come out for a few days it's time to do a waterchange. Funny thing is, it's just the solitary rock of it that tells me, the stuff that's made it onto the rocks (grrrr!!!) isn't sensitive.
So, right now I'm doing bi-weekly 30% waterchanges because I have 30 Bangaii babies in a "net" in there, and boy do they add to the bioload!
I test maybe twice a month, but my levels usually stay ok because of the large waterchanges. I just end up dosing a bit of calcium, and some alk (w/ pH buffer). I have been doing waterchanges with Mg of 1500 in hopes of helping to battle the GHA I have right now because of the massively overloaded tank from the baby Bangaiis. I need that new Banger grow out system up and running!!
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~ Mindy
SPS fanatic.
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