Do you have a lid? It will most definitely jump. They tend to be a bit skittish over all but once acclimated to the tank and have picked a hole to hide in then become pretty bold (as long as they know they can go to their hole quickly if needed). Until they pick a home and anytime they feel like they cannot get to their chosen spot they will look for an out and that is usually up and typically out of the tank. I dont think there will be issues with the watchman or pistol unless maybe the firefish trys to use their den.
I def have a lid too many freshwater experiences with jumping but yea I was looking into them do you think one of a pair would do nice?
Either way. I have never had an issue with firefish adding 2 at the same time its worked for me with helfrichi, red, and purples. Dont try mixing the different types that does not work out well. Also dont try to add a third because the 2 are working well that doesnt go well either. The only dartfish commonly avail that seem to do ok in larger groups are the scissortails and Zebra.
As long as you can sex them in the store and get a male/female you should be fine
Not that that is a bad idea just kind of hard to do. Best bet would be get a couple good pics of their belly area and zoom in to see the shape of the little tiny sexual organ that is just behind the first bottom fin. I am not good with anatomy names sorry, I know what to look for though.
Acclimate well and even do a short quarantine. At minimum, give them a 60 minute ruby rally pro bath and at store, assure they are not thin, dont have damaged fins and are eating and breathing normal. Alway ask to see any fish eat
I never had this problem with 2 but 3 or more yes every time. Its like they get used to the tank its all fine until that point then they start the beatings.
My LFS has a guy who can sex them right then and there and thats how I got my pair, but yes not every store has someone who can do that
