i have a 10g and a 20g cycled, one was free, slate bottom 20, and a 10g was free when i bought the 125, any suggestions on what fish i can put in these tanks, nothing boring, but is there anything "cool" you can put in these small tanks?
10g would make a good neocaridina tank. Gravel and leaf litter substrate, lightly planted with lots of driftwood, and chocked full of shrimp. I like red cherries, I think they stand out against the greens and browns really nicely; there are a bunch of others that are great. I think you could fit a good number in there to.
The 20g would make a nice apisto tank. Throw some pots in the bottom with a few different strains and some nice dithers on top.