ibbledibble
Fish Addict
that is pretty strange. what type of test kit do you have? the strips are notoriously unreliable, and i think they can go a bit dodgy if they are really old too? maybe try taking a sample of the water to your LFS to see what readings they get? what size tank is it? and whats in it apart from him and the shrimps?
And no, it's not a strong suction...he's perfectly capable of swimming directly in front of it without getting stuck... 
I'm assuming that means he's happy??