My glass is 3/8" thick and I've tried both 1/2 and 3/8 settings on the pump.
The problem I run into is that it'll be quiet right when I adjust it and then it's like it's slipping down the glass or moving slightly that's causing it to vibrate.
I might have to take it apart like you said and check to see if something is wrong.
Just a little frustrated with it all right now.
I'll set it up at night quiet as can be and by the time I wake up it sounds like the tank is going to shake apart.
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