I have some frags of SPS in my frag tank that have GHA around the base of the frag. Is it OK to dip the frag in HP? or should I use a toothbrush to spot clean the base?
I've used the toothbrush but you need to be careful, not too hard and not too long. Different SPS will probably react differently. One of mine took a week to come back after I thought I lost it.
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