I try keeping my datnoids with my Gatf and all hell broke lose. The dats pick and pick chasing it around non stop. Anyone keeing Dats and ATF together in harmony?
Oh wow that sucks. Gotta be careful mixing ATF with anything.... They look and act just like baitfish and many other monster fish will view them as food.
How big are your dats and GATF? How big is your tank? ATF are very passive until they get to around the 7-8" mark.
i've had dats with my ATF's since the beginning of my tank and never had any problems, i have about 10 dats of all different species, but they were never large enough to consider the ATF's food ..... Dats, however, are some serious predators and have a deceivingly huge mouth, so if your dat is way bigger than your ATF it could become a problem.... add a couple more dats and hopefully they'll focus on eachother and not the ATFi've heard rumor of some dats just being nasty, could be that you have one of these guys as well.... how long have the ATF's and dat been together?
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Sounds like you need more room for a 9" GATF. 75 is waaay too small. Mine was 7" when I had him in a 150 and that was small.