just to add. i think the nitrates are not off the scale as ive done a few big water changes when the pH dropped or increased to prevent the cycle from stalling. i have noted them at 40 but they are somewhere between 40 and 80 on the API test chart.

yeah ill be keeping a close eye on the water as the stocking in the tank is set to cost me a small fortune this weekendSince you've got some mature media in there and you've had a pretty long stretch of 12-hour double-zeros I'd say you're looking pretty cycled there. Any time the overall elapsed time is less than 5 or 6 weeks though I'd monitor the first stocking quite carefully, watching for mini-cycling. WD
not that i wouldnt anyway mind 