Silicates should not be an issue anyway. I have the Seachem PhosGuard in the filter and it is supposed to remove phosphates and silicates.
This goes back to my thread of " about to give up"...I just can't figure out the issue, and seriously am just about to give up on that. I honestly am beginning to think that there is nothing I can do about it. I really thought this new canister filter would help because of superior filtration, but that part goes with this thread, it does not seem to be superior to the HOB at all in filtration. Not even with the PhosGuard and the Purigen in it, it is not really doing anything for the tank water that the cheap HOB didn't do. But then again, it may not be the lack of filtration, it may be something else entirely that I have just not figured out yet.