I have a 100 gallon trough with an automatic float. I check it every day as it is just out my back door. It is up against a fence as that is the only way the hose will reach and it helps protect the float and hose. Anyway I only have seen 2 maybe 3 drink at a time from this. Is this sufficient for about 20 head? I know they technically have unlimited water with the auto float but I was wondering if I was was inadvertenly restricting their water intake by not allowing more head to be able to drink at once?