Hmmm... that doesn't sound right... if its still under warranty, you might wanna consider sending it for a check? I've come across quite a number of complains on the noise issue at Nano-reef, so you might wanna browse through. Btw, Gouldian was very kind in demonstrating the MP10 during the exhibition @ Serangoon CC some time back. It still works fine with 10mm thickness.
Did you see the HOB fuge mod link I posted in the earlier pages? If you fit some filter wool, it will prevent your cheato from clogging with detritus.
Knowing you, you'd probably add on to comy's MCE 600 review, so I'll wait for pics!