My elite stingray 15 filter has well and truly had it, its power has been going for about a month or 2 now, and it has been making a very loud grinding noise, getting worse. There is nothing inside the motor making this noise i have had it to bits several times on the hunt, it is old, and slightly too weak for my tank... SO new filter time.
I have my hopes set on a Fluval u2 or u3 dependant on the price i can get but.... HOW do i change from an old filter to a new one without messing up the biological stuffs that has grown in this current filter?
Could i run my old one and new one together for a week or so, then move some sponge or something into the new filter and remove the old one? Suggestions?