I have a 15-gallon bowfront tank that houses 14 Celestial Pearl Danios. It is a planted tank, but even with the plants and fake driftwood with lots of hiding spots, they are very shy and skittish.
Lately, my guppies have been having lots of babies, so I have been moving the fry to this CPD tank until they reach a decent juvenile stage and then moving them out. This hasn't seemed to bother the CPD because they stay at the bottom and the fry stay at the top. However, I have decided not to let these guppies have any more babies and have decided to move the (single) male out of the tank. Can I put him in with the CPDs? Will he nip them or otherwise stress them out? I know CPD do best in a species tank, and that's what I've had them in, but will 1 male guppy be an issue?