I bet that pump and hose is sounding pretty good right about now, eh??How keen are you on doing a water change. 50% might get nitrite below 5.0 depending what the level actually is. 100 % should get rid of it, maybe not all as there's still be a bit of water in the substrate, but certainly very low.
If you decide to do a water change, test nitrite after half an hour. If it's below 1.0 you can add ammonia. If it's above 1.0. wait till it's below 1 before adding ammonia.
Il replace 50% then report backIf you happy to do a water change, yes it would peed things up a bit. But check nitrite before adding any more ammonia; after half an hour it needs to be below 1.0.