Do you have any siphon currently?
I am afraid for a tall tank, the siphon won't be able to suck out water if it's too small.
Always get a bigger size of siphon unless you have shrimps/small fish in your tank or your tank is very small.
If your siphon is too small, it will take longer time to siphon out the water.
If you keep shrimps, you may want to have two sizes siphon.
One big siphon and one small siphon with flow rate adjustable to prevent the shrimps from being sucked into the siphon especially the shrimplets that are extremely small.
Recently, I bought a GEX gravel cleaner (siphon) for my shrimp tank.
It has a flow rate control but I find that it takes a long time to suck out the water from my tank.
So, I still prefer my bigger siphon.
My prefer siphon for faster changing of water.
https://www.amazon.ca/dp/B07DFFHHJ9/?tag=
Take note of the hose diameter.
The bigger the diameter of the hose, the faster is the suction/flow rate.
Some gravel cleaners with flow rate control for your info:
Easy to operate effective gravel cleaner With added flow adjuster All trapped waste at lower part of the gravel can be siphoned out For any aged aquarium with gravel, there are bound to have trapped dirt and sludge in the deeper portion of the gravel If not cleared of these waste/ sludge...
www.fishbazaar.sg