haha ok I get it thank you. I will stop adding SO MUCH acv, maybe THAT is why they don't like it!Above 130F might be hot enough to kill the beneficial bacteria. 80F is just fine.
Different microorganisms thrive at slightly different temperatures and conditions, but it's not something we need to worry about. Just remember that while your FF will ferment at 60F, it will be very slow and result in a different product/smell than when you ferment at 80F or 90F. Higher temps ferment faster. Below 60F fermentation slows WAY down, what would take a day or two at 80F might take a week or two at 55F.
No need to add more ACV. If you do (especially if you're not measuring), it would be very easy to add too much ACV and while it won't be spoiled, it could be too acidic for the birds to stomach. Try this experiment: take two same size water glasses, in each glass, add 2tsp of ACV and add 6-8oz of water in the one of the glasses. Drink both glasses and tell us which one you preferred!