The lower you can drain your hose the faster it will drain, which is why my DIY python has a run of tubing which goes from the sink down to the tub.
I've got a system worked out now, I drain my 90g with a 400gph pond pump which goes to the kitchen sink.
I drain my 40b planted tank to the bathtub with my python.
I'm thinking of putting a tee and ballvalve on the fluval 406 that's on my oscar tank so I can use the canister to pump water out of a window that's 2ft away from the tank. Flip the valves back and its pumping water in a loop in the tank the way it should be
If I time everything out I can drain them all basically at the same time and refill them with the water changer and prime, one after the other - I can get the temperature right at the sink just one time, and just flip the valve on the water changer in the faucet to siphon mode, then move it from tank to tank - flip it back to fill mode, and never turn off the sink.
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