Join Date: Oct 2012
Location: North Central, OH
Just to make sure I understand you correctly, you plan on putting and floating the betta in the critter keeper and having the Cories QT'd in the 10 gallon, right?
I think that would be a great idea, as long as you are careful not to use tank water during water changes and change the critter keepers water pretty often (2-3 days max time between changes) You could also think about moving your betta into your 2.5 until the cories are out of QT, that means a little more time between water changes. Up to you.
I think you should get 1 more cory though. Just so they have a small, but proper school. You could easily fit up to 5 plus your betta in a 10 gallon tank.
As long as your betta isnt overly aggressive I dont think there would be any issue with the cories and betta being together. i have cories in all of my 10g+ tanks, and they do wonderfully with every one of my fish. (other than my bettas eating their eggs!!)
Hopefully I answered your questions correctly!
10 HM, 3 HMPK, 5 HMPK fry
8 German Blue Ram, 5 Green Dragon BNP, 4 Albino BNP, 4 Calico BNP, 6 Red BNP, 5 Kuhli Loaches, 2 ADF, 7 Peppered Cories, & 6 Tiger Endlers + Fry
12 full time tanks, 4 NPT, 6 QT/Breeders