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Mixing the gel with the 2 part causes the 2 part to set up PDQ. So be sure to have everything ready to go ahead of time.
Also, I don't use the 2 part directly on the frag as it gets hot when it cures and seems to cause problems with the coral. I generally use just gel with the frag to a piece...
Damsels are very territorial and aggressive. Not to mention, near impossible to catch. I've just acquired 4 PJ's which were badly beaten by a domino damsel. If your clowns and or other inhabitants start to look bad, i.e. missing fins, the first suspect should be the damsels.
Mine are quiet as a church mouse. I have to try and hear them. There are many things on my tank that are noiser including the air intake and discharge of the skimmer and so on.