Skimmer driving me nuts >.<

[mrhasan]

Alright so my vertex in-80 seems to be very unfriendly! Every time I turn it off and then turn it back on (after all the water is drained from the inside of the skimmer), it overflows for few secs (thus pulling out water) into the cup (like 1/10th or something) and then the bubbles go down. Is that normal? This mainly happens after water change (I did put a 10mins delay in the skimmer after the pumps turn on so that the water level gets within an inch of what the skimmer sits in).