Yea, I'm thinking that as well, it has been running fine for a long while now. I'll just replace it, thanks shoggy. Btw, any DDC pumps you recommend? I'm using the DDC 3.25 18watt version.
That all depends.
Do you want very quiet pump? Go D5.
Do you want a pump that has more head pressure because of a complex loop? DDC.
Do you need a small form pump because of case build/design? DDC
If you decide to go with a new pump, I personally would have gone with AC D5 Aquabus pump and use it that way, freeing up the channels for fans.
Again, it all depends on how you want to plan this.