Hi there,
I came across this and from what I read I don't quite understand what a horny tank is. Is it just another name for a coolschip or something else altogether.
A horny tank is a batch of simple wort inoculated with LAB and/or Brett, and fed periodically. If a brewer wants to funk up a batch, they use some of the slurry from the horny tank.
It is referred to as a horny tank because it is always ready to go.