Looks like a good setup, the only thing that makes me nervous is using the same fill hose in multiple tanks. If one tank gets sick, and you haven't recognized it, you risk transfering it to other tanks.
I have a heavy spring clamp for each tank, my fill hose has a piece of wire clamped to it that wraps around the clamp, holding the fill hose a few inches above water level. This also gives me the option of directing the flow to just about any area of the tank. The fill hose never touches the water.
To adjust the fill temp, I have a Y fitting attached to my utility sink with a shutoff on the 2 ends of the Y. One end goes to 50 feet of water safe hose that leads to the fishroom with another valve at the fishroom end, the other end has a few feet of hose in the sink. I adjust the temp at the sink, shut off one valve, open another, go across the basement to the fishroom & start filling. I add dechlor as they fill, every 10 gallons for larger tanks, every 5 for smaller.
Each tank has a seperate 1/2" drain hose that attaches to a longer hose. I got that idea at the dentist, when they use the same hose for each patient, just change the end. I use these if I have new arrivals or suspect something may be wrong with a tank.
I also have around six larger 1" drain hoses that are used for the usual water changes. These are anywhere from 4 feet to 6 feet long, with a couple feet of pvc pipe on the ends. I don't use them for more than 3 tanks in a row, paranoid of disease as always. These will drain 5 gallons per minute,everything drains into a heavy duty 35 gallon plastic can. There's a 1300gph pump in the can with a hose running to the sump pump. It plugs into a switch box on the floor I can flip on & off with my foot. With this setup I can drain & fill at the same time, 14 tanks, 300 gallons in, 300 gallons out, in around 2 hours.
Tolak