Hi folks, I have a 20G tanks with a Betta and some glass cats. I'm going to add some other things once my tank finishes cycling. I have a penguin 350, and I think the flow rate is a little too strong for the Betta. There are some places he goes where there's not a lot of current, but sometimes I see him resting up against a plant and it looks like the current is pushing him into it. My question is: can I plug the filter into a rheostat (dimmer) to adjust the flow rate? I assume it's just a sealed motor with an impeller. Just wondering if anyone has done this or knows about it. I don't want to damage my filter motor. Thanks!