Thanks for the tonic salt tip Keri Anne. I'll remember to ask next time I am there. I don't use it myself, but like you say I could wean them off it slowly in the Q tank next time. I take a fair bit of care and time to get them used to the new water conditions. Doing the whole make sure the temp is the same, then taking out some water out of the bag and replacing it with water from the tank, repeating until I am fairly certain there is little diff between the two.
They are doing fine today, they are active and hungry. No female in the tank with them, but a bit of no contact sparring all the same
Thanks all, I'll keep them in Q for a month. Might be time to buy a new tank. 8)