For GATF, it's "harassing then gone" for me. I won't mix GATF with anything that could harm it even in the slightest way, because that thing will either stressed GATF to not feeding or GATF got pissed one day and kill it. Right now my main tank only has 1 16" GATF and 3 6" Tinfoil Barbs. Even now and then the barbs got a huge bite on their bodies but still live through it. This fish need to be kept alone unless you have a pond IMO.