i've already stated my personal opinions about prazi, heh. making the effort to catch 'em all and dip 'em all together will greatly reduce the overall chances of one fish re-infecting another after placing individually dipped fish back into the system. if you keep dipping only one fish at a time, you'll NEVER get rid of flukes in the dt, and it will be far easier for one fish's flukes to spread back to another. (even though once dipped, i've found fish to usually not get clinically re-infected, vis-a-vis skin flukes,-again, ymmv )
i don't believe in stress coat either, and i think it's a crock, along w/all other slime coat additives, ime. mostly they just add organics to the water, and can interfere w/breathing if accidentally overdosed.
there's no reason to aerate water if you aren't using prazi.
for catching fish quite easily-place a lee's spec cup in one corner of the tank, opening facing the corner, and about 2" from the corner, along the side, and chase them into the spec cup w/ yer hand-takes abit of practice, but once you get the technique down, it should take an avg of a minute or two tops to catch any fish. OR you can train yer fish to swim into a net as soon as it's placed in a tank by ALWAYS feeding by placing tasty food into a net, and holding it patiently at a 45รยบ angle near the top of the tank-after a week or so, your fish (most of 'em, at any rate) should voluntarily swim into the net by food association alone. fish, like most critters, are quite pavlovian.
removing the live rock from the dt into a bucket/tupperware makes catching anything a whole lot easier, too-yeah it's a pita, but so what? peace of mind trumps a pita any day. it's mebbe 1/2 hr of an 'inconvenience' to get things healthy and happy. no brainer, afaic.
hth, g'luck