This model with three slots of 3/4", 1" and 1 1/4" doesn't seem to be working. The minnows won't go inside but rather swim over the top. So next I will next try 3 1/2" slots using 2x4's. If this size entices fathead minnows to swim inside, the finished stacked unit would be about 2' wide x 10' long and stacked several compartments high. My question is, if fathead minnow are territorial would a lot of the undersurface not be used for egg deposits because the fatheads need to have some separation from each other? If this is true I don't want to waist my time building something that won't work well.
