Alright. I have three betta afflicted right now, two crowntails (Cassio and Wheatley) and one Halfmoon (Simple).
Originally Cassio and Simple were tankmates in a split 10gal when I noticed that Cassio was moping about in a slightly odd fashion. He wasn't really struggling or in pain, from what I could tell, but he's typically an active and vibrant fish who loves it when I come into the room or even twitch in his presence.
When I noticed his personality shift (last week, maybe Wednesday), I moved him to a smaller 3gal (Wheatley's tank) and moved Wheatley into Cassio's old slot in the 10gal.
Simple seemed completely unafflicted and has been swimming around just fine aside from some minor bloating which I noticed last night (Sunday, 10/23).
However, now Wheatley is showing the same moping tendencies that Cassio was, except he does
seem to be struggling. So, essentially, it works like this:
Cassio + Simple in a split 10gal maintaining 74-76F. Wheatley in a 3gal maintaining the same temperature.
Cassio starts being lethargic, laying at the bottom of his tank or propping himself against plants. Move him to the 3gal and Wheatley to the 10gal. Simple is unaffected.
Four days later, Wheatley is lethargic and struggling to hover properly in the water columns. Simple is a little bloated. Cassio is still lethargic.
At the moment I'm boiling everything. I cleaned Cassio's tank (including gravel, plants and his heater) and put in fresh water and some aquarium salt. He seems to be trying
at swimming around more, but generally still seems a little lethargic. I'm counting it as progress.
Wheatley and Simple are in these two half-gallon-ish tupperware containers right now which I change the water in every hour or so while I boil their gravel/tank/plants. I'm also throwing in small amounts of aquarium salt with each water change. Simple's just swimming along, being simple, but Wheatley is having his usual struggles.
I haven't fed any of the three since, probably, Friday. What strikes me as odd is that Wheatley chased my finger around for about fifteen minutes in my attempts to play with him, despite the fact he was struggling to be at the surface of the water (from what I could tell). Cassio also seems at least temporarily interested in my presence near the tank.
So I suppose I'm wondering if it's depression/season change or something more serious? I really don't know what else I can do besides give their tanks a really good cleaning and keep up with frequent water changes (about once a week for both).
I do not have test strips (yet) so I don't know the levels of toxins in their water, but I do use conditioner (of course). I also feed them two pellets each once a day, and occasionally freeze-dried bloodworms (though they haven't gotten those in a few weeks).
I also think Wheatley might