I, personally, saw it for what you intended--a comment on what happens when underinformed hobbyists purchase a fish about which they have little to no information (or, possibly even worse, incorrect info). I figured, though, that I would make sure that my post was a little too easy to be misinterpreted, so I added the sarcasm note. Yours was easy to interpret, IMO, so I think it was fine and a good commentary to boot.