With all due respect to Bookfish...
Koralbeauty, I think I read your previous post in a different way than Bookfish did. Perhaps he "heard" it with a different tone than I did.
I happen to agree with much of what you've said - natural controls are much more reasonable and have less side-effects than chemical "miracles".
I always recommend fixing the source of the problem first, rather than throwing medicine or chemicals at it, and I employ the same techniques that you do.
Having said that though, there are still people who *prefer* to throw a chemical fix at it, rather than fix the underlying problem. Or people ignore a problem for a long time, before they finally resolve to fix it, and by then, some additional "help" may be in order.
Having said that, when someone asks my advice with such a problem, I usually offer up "natural" solutions - improved husbandry, natural pred
ators, improved water quality - whatever is appropriate to fix the problem at hand. But I do get requests for stuff like Chemi-Clean for Cyanobacter (but I've found that dosing Magnesium works much better, without side effects), or Joe's Juice for Aiptasia.
I tried Flatworm eXit myself a few years ago for a severe red planaria infestation - and lost 7 fish. Now I recommend freshwater dips for affected corals. For the record, I don't blame the chemical - it worked "as advertised"... it was the toxins from the deceased flatworms that wiped out my fish - I followed directions to the letter, but my infestation was more than severe... but I digress. Freshwater dips work instantly and rather thoroughly, and I've also learned that planarian populations will wax and wane on their own... I don't carry Flatworm eXit anymore - from what I've heard some of the planaria aren't bothered by it anymore anyway.
I've never used Chemi Clean - frankly I'm afraid of it. I had a number of customers asking for it, and my attempts to help them holistically were moot, so I carry the stuff, and when people buy it I give them a big heads up on the importance of doing a water change per instructions - and I also tell them that without fixing the source of the problem, they'll become dependant on the stuff. That's about all I can do.
I understand and respect your philosophy of fixing problems at the source - and I live by it too... but in this retail game, there will always be people looking for a quick fix, or at least a hand in getting ahead of a problem, and IMO some of these products do a good job in that. For me, to not carry such products would be shooting myself in the foot - if I suggest better husbandry etc., but they *still* want the chemical fix, they're going to go elsewhere to buy it. So, I'll carry it, I'll still suggest a *better* way to deal with it, or at least how to manage the problem better when the accute issue is dealt with.
Unfortunately in this culture of instant gratification, it's hard to impart wisdom like that at times because everybody wants it now.
I wish I had $1 for every time I've said, "Nothing good happens fast in an aquarium."
Jenn