This is a perfectly valid question, no cause for removal by admins besides the possibility of hijacking a thread, so I’ll try to sum this up and get this part of the convo open and shut quick.I appreciate a bit ‘left field’ of the topic but out of interest why do angels not get the same level of controversy for keeping in too small tanks as, say, Tangs? Does no one buy young larger angels and move them on when bigger? I don’t hear of ‘Angel Police’. Hope it’s ok to be educated - if not Admin can delete this question
Two things come to mind:
1. Angelfish are generally less readily available, more expensive, and harder to keep. This generally pushes away any beginners and those that aren’t pushed away is generally kept to a minimum. Some have the smarts to ask about a pricier fish before buying it as well.
2. While Absolutely no full size tang can be placed in nanos, regarding angelfish there are readily available options such as those from the centropyge genus, for mid sized tanks one can even go with paracentropyges. These variety of options that work create an unlikeliness for someone to put a large angelfish for ex one from the Pomacanthus genus into a undersized tank. If there is a case of it, it’s probable someone will make an effort to point it out.
Hope this helped,