can someone please help me Iāve upgraded my aqua 1tank filter to a Fluval 206 external. My tank is 130litre, the problem I think I have is the flow, although we have it close to the top so itās breaking water it doesnāt seem to be disturbing the plants lower down, so is this surface movement ok I feel itās a little to ferocious, what are your opinions please. Also Iāve had them both running now for three weeks, when would it be safe to remove the internal one please. Thanx in advance