hmm so the reason im trying to make this as easy as possible is because my family will be taking care of my fish while im at school and I want to make sure there are few ways they... can mess up basically with water changes. Im just wondering if theres a valve i can get so if the pump turns off while pumping water, it wont drain the tankNo, it wouldn't. A shut off valve would. A check valve just allows water to flow in 1 direction instead of both. It's easy enough to just lift the end of the hose high enough to break the siphon and it won't start bqck up until you start the pump again.
So one more thing... from my understanding, a ball valve has to be manually shut on and off... what if I had a check valve as a sort of safety net? does it straight up not stop backflow or is it just unreliable? Also, im planning on attaching 1/2 in tubing directly to my faucet, is there a possibility of back siphoning there, even if the tube is secured to the faucet?This will get the job done. Just make sure you get the right sizes.