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i suggest a massive water change. like 50% then check your levels in about 30 mins. Work on getting rid of the canister filter and try to impliment a sump with a refuge with cheato. cheato will suck up the remaining nitrates and a sump will increase your water capacity cutting down on massive level spikes.
Also, 20-40 is still too high on nitrates. Strive for 10 or less. 0 is optimal, but hard to get sometimes.
OH and one other thing. What test kit brand are you using? I suggest Salifert test kits. they are said to be most accurate but thier pricey. Still worth the extra cash though.
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