Air coming through python during water change

[zeulas1]

Hello everyone I noticed a lot of air coming through my python during my water change I am on my own well I have the water on low And the hose is well above water level as I fill PH is 7.6 in the tank and 7.6 on the water going back in the tank. I fill directly from my my tap. I notice on large water changes 50 to 60% Fish do not stress during water change but for a day or two after they seem slightly stressed. This air is a continuous problem.any thoughts? My tank is a 150 gallon high with 15 adults . Fishes colors and appetite are good 1 inch of a gravel and some pieces of driftwood

[Bill63SG]

Sometimes where the hose connects to the vacuum part can leak,you can seal it with some silicone.Do you get air all the time,or when the water gets to a certain level?Make sure to tighten the other connections also.