So my cycle seems to have stalled at high nitrates. Help please? :D

[Enigma]

You need to test your new saltwater for everything before doing a waterchange: but especially ammonia, nitrites, and nitrates. You need to be sure that you've got zeros for all three in your mixed water.

If all three are zero, that eliminates one possible source.

If all three are zero . . . Something is decaying in your system: beyond what your bio filter can handle. It could be gunk in your filter, over feeding, dying critters . . . ?

[Spyd]

I would remove the canister from the system and use a reactor to run GFO and/or carbon. The foam in the canister acts as a nitrate factory as it collects food and dietritus. Also, are the hoses going to and from the canister ribbed? If so, gunk and debris settle in these ribs and decay as well.

I agree, that live rock and skimmer should be sufficient for your bioload.

[Cal_stir]

Remove the foam from the canister filter and keep the biomax and carbon.
The bacteria that eats nitrates is anerobic and only lives in very low oxygen enviroments like a denitrator or deep sand bed, my personal experience says that DSBs are useless and more problematic than they are worth(I'm sure some will argue), the other method is to grow aerobic bacteria(lives in oxygen) with a carbon source ie, biopellets, vodka, sugar or vinegar dosing, by growing the bacteria nitrate and phosphate are used are used up building the cell walls of the bacteria, the bacteria dies and gets removed by a skimmer thus removing the nitrate and phosphate from the system.
You must have a good skimmer for this method. Growing macro algae will work to, but that requires a lighted refugium and is somewhat limited to amount of nitrates it can take up.
I think the simplest most effective method you could employ is vinegar dosing, read this.

http://reefkeeping.com/issues/2008-08/nftt/index.php

IMO sulphur denitrators rule.

[Xyres]

Thanks for the continued support everyone! I have a few things to say as well as ask a few questions. Today I removed my foam in my 305 and added more carbon as unfortunately a sump is not an option with this tank. I also started vodka dosing today so i hope this helps as well.

Now my question is about a GFO/carbon reactor. Is there one that will work without a sump? In the past I looked at the BRS GFO/carbon reactors but they seem to be for sumps only. Any ideas?