
The good news is, the remaining 3 look great and appear to be very, very happy in the 55 gallon.

The bad news is, two of the them have paired up, and I feel like the other one (I believe is a female) is like a third wheel. She doesn't come out in the open as much as the other two. Also, the two that paired do that wonderful loachy dance, wrapping around each other, and swimming the length of the tank looking like they're connected to each other. I love watching it! But, they pretty much ignore the third.
I just happen to have a cycled empty tank available.. I'm thinking of getting a couple more dojos and put them in the empty 20 to quarantine them for a few weeks, and add to the 55 and see if that makes the lonely girl happy.
Any opinions? Any suggestions of how many I should get? Currently the 55 has about 7 dither fish (danios) and my corydoras catfish (3 of them). I have 6 tiny rasboras in there right now but do not yet know if they will be permanent residents. They get along with everyone in the tank, so it really just comes down to if they thrive in there. I have a strong current in one half of the tank and a very gentle one in the other half. Lots of plants (real & fake) and lots of hiding spots, sand substrate. The temp has been in the low 70's and everyone seems fine with it.
Yes, it is possible for me to move some fish out of there if they really don't belong together, I would just use the empty 20, they are all tiny fish (except for the dojos of course, the 55 was set up specifically for them), but I would use the 20 as a Q tank first with the new dojos before I went moving a bunch of others around permanently.