well, i'm glad you had some good experiences with solo pygos, but i don't agree with you. the most healthiest looking pygos i've seen were in big shoals. from my experience and most of pygo keepers' experience i know, when it comes to pygos, the biggest the shoal, the less stressed they seem. I don't believe either in odd numbers thing, and 20 gal or 30, it's still way smaller than a river, so how can we say how many gal is right?
now, i think that a rule like 20 gal per fish is peritnent in the hobby since many people keep them in way too small aquariums. therefore, the 20 gal rule kind of sets standards to prevent bad maintenance.
so if you think it's right to keep single pygos, fine it's your opinion. but with respect, i'll stick to what researchers that are studying these fish both in their natural habitat and in articficial environments wrote on the topic (since it makes full of sense according to what i saw in aquariums) instead of what you experienced in your tanks.
as for me, end of the Off-topic, sorry if it polluted the post
now, i think that a rule like 20 gal per fish is peritnent in the hobby since many people keep them in way too small aquariums. therefore, the 20 gal rule kind of sets standards to prevent bad maintenance.
so if you think it's right to keep single pygos, fine it's your opinion. but with respect, i'll stick to what researchers that are studying these fish both in their natural habitat and in articficial environments wrote on the topic (since it makes full of sense according to what i saw in aquariums) instead of what you experienced in your tanks.
as for me, end of the Off-topic, sorry if it polluted the post