I agree with the GDA being linked to biofilter maturity. I had the nastiest outbreak I'd ever seen in a new tank (it literally coated 80% of the tank), despite being precycled and not being a 'new' tank (the tank/substrate had been used for a different setup previously, so no silicates or whatever). In a few weeks it was gone. I never had the GSA problems like that though, so I can't comment there.
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Metapimp #1 (and only) - because somebody has to keep all these pimps in check.
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