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

[mseepman]

Not totally sure why your nitrates stay high, but I would start by verifying that your test kit is giving you good readings. Could you verify what you run inside the canister?

From there, you could look at chemical/filter based methods of reducing them. Several companies offer liquid nitrate reducing products. Biopellets are also very popular and can run from an external fluidized reactor for a pretty reasonable price.