Well, I know 1 of our recent AC folks is from Mexico (Lalo). But I have no idea if his water might be similar to yours, he lives 100's of miles away. You may be our first member in Panama! Bros in espaniol? I mostly only "speak" food spanish & not much.
Ask at your local shops about clubs. Talk to other customers too...if you're shy, it's time to step out! Say "excuse me, do you know a local fish club? Do you grow plants? Where else should I go for another nice shop?" Not best with distracted parents of small children but with a friendly (or flirtatious?

ahem, cough) smile...LOL...said the old married woman, nothing wrong with friendly & smiley of any kind. I've accosted other shoppers (& been asked) about our plant club meets. It's all good...& fun!
Maybe there a Panama fish group on FB or other local board? Nextdoor or its equivalent? I'm sure there's something...