I've just added an external filtration unit to my 90g. It is a juwel 400l with internal filter which wasn't dealing with the waste. The new unit has a spray bar which oxygenates the water beautifully (my O2 is 8+) but the water is constantly full of bubbles now. Reading up on frontosas, they like still water, with hardly any movement. Should I move the bubble bar under the water line so it isn't moving so much?