I have a 6g walstad style nano tank on my desk. I moved to a new apartment that is much colder than my previous living place. The tank reads 60-65 degrees this month.
I would like to put livestock in this tank but I am unsure what fish are hardy enough to thrive in a walstad bowl/nano that is also unheated.
I have kept H. formosa and RCS in unheated containers before, but nothing else.
Leptolucania ommata, any Elassoma species, any Dario species...assuming your water does not go much below 60 degrees on a regular basis, they should do fine. If it does, they might still be fine.
Ah, I forgot about pygmy sunfish. Not sure if a 6g is large enough for them but I'll keep them in mind.
Ah yes, WCMM are really lovely fish. I had longfins a couple years ago and they are very pretty. I found them to be pretty active so I don't think a 6g is large enough, but someday I'd love to set up a tank for them again!
Which got me thinking, paradise fish can tolerate "cold" water but 6g is a little small for them?
This month sure but your location is listed as Ithaca NY so it's definitely going to get colder. Will you be able to maintain the the temp of the apartment? Why not use a aquarium heater?
Heterandria formosa- the smallest north american fish and the smallest livebearer period. Does well in 60-78 degree water, but prefers the cooler end. Easy and hardy as heck. And great personality. And looks nice. And and and...and I'm sentimental over my colony that I gave away...
I had an H. formosa colony too! Yknow, I was always a little disappointed that they were not colorful, but now that I don't have them I actually miss them!
Paradise fish hit 3-4 inches WITHOUT the tail and would definitely be too large...believe me, my paradise fish (who never reached that size due to newbie mistakes) used every inch of my 29 gallon, which is currently the smallest tank I would keep PF's in. However, Parasphaerichthys lineatus (and possibly its slightly larger cousin, P. ocellatus) would likely work in there in a pair or even a group for P. lineatus. Granted, neither is usually especially colorful, but both are poorly studied and they could be an excellent target for a journal on them.
Regarding P. lineatus, thank you for the idea. I will keep my eye out for some on Aquabid...
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