I have a quick question. I see 1 thermostat for a 2 shelf 4 tub setup. Are you running all 4 tubs off of the reading from 1 since they are the same size in the same shelf unit with the same heat tape under it? I'm guessing you still have thermometers in each tub. I am thinking of doing a similar setup for 2 BP's yet to be purchased. I was thinking of just using 1 shelf with 2 bins till they get big enough to need bigger tubs and then I can put each on there own shelf.