hi there, my tanks not really new iv had it for a while, its a juwel trigon 190 i just wondered if there are any owners out there who are experts on these babies, my filtration works well but very noisy and somethings rattling i cant see what though, im wondering wether to replace the powerhead and the heater just so i know theyre brand new and workin at the optimum level, also is there anyway of lowereing the power, i have a water diversion tube and it creates a bit too much current, do the powerheads come in different power volumes? really appreciate your time and help in advance