I've been keeping aquaria since 1974 and had something to do with very early Usenet aquaria newsgroups and mailing lists in the 1980s. Over the years I've run the Cryptocoryne mailing list run and the livebearers list. I read aquabid a lot for my fish "fix". I did a couple of killi websites in the '90s and a general purpose encyclopedic work and another about Cryptocorynes and other aroids.
Point of trivia: the killifish mailing list I (still) run was the first tropical fish mailing list on the Internet and
aquaria.net were the first two tropical fish domain names ever registered. I think mark Barnett's fishlinkcentral was the third. It was easy to keep track of them back then there were none, then there were a very small number.
These days I use new top level domains for this fish stuff or tied to, they didn't pan out and I'm tending more towards geographic domains. The lack of cost and need to renew them is better suited for reference sites