Sorry I miss read your gymnos stats, thought you had 3 males and 2 females, not male 3 inches and female 2 inches. The 30g should be fine for them but they'd appreciate the room of the 55g. Your species of gymno are harem breeders so I'd recommend getting more females if you do move them to the 55g.
As for other species of fish to keep with gymnos you can keep any thing that can handle the colder temps and has a peaceful demeanor. There are some types of tetras that could work, along with C. paleatus, some types of live bearers, white clould minnows, and others I can't think of at the moment.
No problem thanks, i have the 3 female notatus are they harem breeders as well or shoul i keep 1 female only, currently the largest female chases the other 2 away and the male will sometimes flirt with either of the other 2 but the big female is a little bigger than him and will usually come overnand win him back i feel like she is in charge.
I would get a couple more female gymnos and do the 55 as a tank for them as well. The orange heads and notatus should have plenty of room in the 125 as the geos don't get too huge on average and the single pair of notatus will probably claim one side of the tank if they spawn.
Is the 125 a 6' tank? That'd be ideal.
The tank is a deep 5' acrylic half octagon, kinda like a bow, with an overflow in the center. Formerly a marine tank with an afixed acrylic top with 2 holes and acryliv covers for them. Its really nice but limits driftwood options, most likly no evaporation.
Or
A deep rectangular glass 5' 125 that the severums are in know, the aggressive guys are going to a 155 bow. Decisions, decisions.
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