Hi I got 5 new female bettas yesterday but 1 is not swimming to good. Finding hard to swim horizontal and every time she stops her tail sinks.
I have a rough idea it could b swim bladder but just looking some confirmation and ideas of what to do next. I called the pet store and they just want to test my water to c if it is my fault prob.
Ammonia-0ppm
Nitrites- 0.5ppm first time it's ever shown, think it was pet shop water I put in with the bettas.
Nitrates-10ppm just got my nitrate kit today, not sure if that is high but I did a 35-40% water change anyway.
I'm also in the middle of trying to cycle a betta cube but it isn't ready yet for any sick females, thanks
I'm going to ask you a lot of questions, so please bear with me. I don't know how experienced you are with fishkeeping, and I'm trying to get a clearer picture of what's going on in your tank so either I or someone else on the forum can give you some constructive suggestions.
What size tank are your five females in right now?
Are there other fish in with them?
Have you cycled this tank using other fish or done a fishless cycle with it?
What type(s) of water conditioner(s) or other additives (like salt) do you use?
Is the tank heated, and if so, to what temperature?
What kind of filter are you running? How long has the tank been set up with the filter running?
Have you fed your females anything yet? If so, what and how much?
That said, here's what stands out to me right now.
In a tank that's not completely cycled or is going through a mini-cycle from having numerous fish added at once, it is possible to see nitrites at 0.5 ppm (which is a dangerous level) and some nitrates (anything below 40 ppm is an acceptable level, the lower the better). Nitrites are
far more toxic than nitrates, so changing your water was good in that you've lowered the nitrite level, but you need to monitor your water chemistry at least once a day until those nitrites are gone and stay gone. The pet store water can make your water quality worse, so you'll find that some people prefer to use a very soft net, like a brine shrimp net, to remove their bettas from the container/bag they came home in and transfer them to their new tanks once they've been acclimated.
Swim bladder problems can be caused or made worse by overfeeding, feeding dry foods (especially flakes and freeze-dried food), and/or keeping a betta at a low water temperature. There's a pretty good article on it
here, including treatment and prevention of SBD, that you might want to read. It definitely sounds like your female may have a problem with her swim bladder.
Also, when you say you're trying to cycle a betta cube, what size is it? The only betta cubes I'm familiar with are generally considered far too small to cycle.