Thanks for the advice. If I ever get back into them I'll definitely incorporate those tacticsActually... Armatus are more hardy but they do NOT heal faster than ATF's. If you want to grow your ATF's beyond 14", you will need to 'teach' your tigerfish where the parameters of your tank are. Try pointing your powerheads right next to the front of your tank, this will create a flow that will allow your tigerfish to learn when to stop and not run into the front glass/plexi panel.