Exactly Jedda. I bought the normal digital sensors and not the "waterproof" ones seen in the picture.

I was referring to this process in this link and thought you did the same.

http://www.mcubed-tech.com/forum/showthread.php?tid=85

If you bought the "real" waterproofed ones, then sorry.

I actually ruined one of the normal ones by sticking it into my reservoir top. The little clear plastic coating is not waterproof as I found out the hard way.