These will be my first dart frogs. I am buying directly from a breeder. I am between dendrobates tinc 'cobalts' or 'powder blue'. My tank has been planted and seeded with sprintails about 2 1/2 weeks ago. And I have producing D. melanogaster fruit flies, bean beetles, and springtails. The frogs I am looking at are all 5 to 8 months of age. They have already been eating fruit flies, bean beetles, and springtails. I am in particular looking at a pair of 8 month old cobalts. They have already been housed together. If the 12 by 6 is to small would a 12 by 12 be okay for a quarantine tank? Also thanks for the advice about the damp paper towels rather than sphagnum moss.