Just an extra thought. Maybe the two gallon waterer you have is more suited to chicks and with an open bucket or crock or larger waterer they would have more room. I do agree, they just love the chase of anything moving, and like the drink the moving water. On YouTube, there are lots of FREE waterers you can easily make. I sure wouldn't buy an expensive one and with only two birds a good sized dog bowl would work, just set it up off the floor of the coop to help keep it clean. You will need to clean and fill it each day, unless it is an automatic bowl. I water my adult birds with a gallon sized horse feed bucket hung on a chain in the coop during the winter. It is small enough they won't get in and drown, I put a concrete block beside it, so they can hop up there and drink without perching on the edge. It stays clean, about 2 inches off the ground and LF chicken-head height. My bantams just jump on the block and drink. I do have one with the nipples in the bottom of the gallon bucket for the silkies. They are special.