not had any sucess yet! i have trifasciata in the same tank, they have spawned 4 times now, no survivers from the first 3, still got 3 weeks old ones at the moment, thinking of taking the baenschi's out, but i'm waiting to see if the dither's(pencils and hatchets) have any effect on the setup, I really don't want to take them out, but I may have too if they dont start breeding soon, as they don't live long i need to keep them going through fry
Sorry londondragon, I don't know the answer to that, but personally I would say no.
Depends what the water conditions are and what rainbows you're talking about. For standard larger Melanotaenia in hard water; then no. However smaller species, such as M.praecox, Iriatherina werneri or any Pseudomugil spp. could work in softer, slightly acidic water. I've got Pseudomugil gertrudae that I'll be keeping with Biotoecus sp.'Tapajos' and they should be fine.
Unfortunately we lost the male a few weeks back, but the good news is before he passed he did manage to do the funcky chicken with his Mrs and we have some babies not a huge amount but at least 3 coming upto 1"TL. We have also had the Trifasciata spawning too.
We have also re done there home, went from a 30x12x15" to a 30x12x18" the pencils and hatchets seem much happier now. Going for the jungle look again, will take some growing in but thats half the fun isn't it?