<a href=showthread.php?s=&postid=11735406#post11735406 target=_blank>Originally posted</a> by jeffmperez
Well according to Rudy, if you are using the mod for the Koralia 4, you can't just switch out the prop. The magnet that comes with the Gs2 is too large to fit in the Koralia housing but the MJ magnet fit's perfect. So you need to purchase a MJ1200 Impeller just for the magnet (unless you have an extra 1200 lying around of course).
I personally don't need the extra MJ 1200 impeller.
Actually you got me thinking...I have two 1200's in my tank behind the rock that provide flow behind my aquscape. I wonder if I can switch out just the magnet that comes w/ the Gs2 and keep the original MJ prop....hmmm. I really don't need the extra flow on the 1200. just the Koralia....
This hobby/obsession drives me nuts some times......