Good god that's alot of nitrate! Are you using RO or tap? I would retest that if I where you. Seems high even for a cycle.
I'm using RO. The water i started with was from an established setup i took along with live sand and rock. I know now i should have used my own water etc.. because ive had nothing but trouble. I have had that result the last 2 tests i have done. The only other thing i can think of is that i did alot of rock and sand moving the day before.Nah the bacteria will be fine as it has but any critters will not like high nitrates for long, if you can afford it get a bottle of PRIME from seachem (most LFS should have it) it's not great to use it often but as a quick detox it will work just fine.
Start getting the sand out if you can, if you use a syphon and have the exit over a sieve or something you can save any life in your sand, if you can't afford new sand for a few days then just wait a few days, you have no real stock so don't worry about it to much.
Sorry to make you panic mate
/cgi.ebay.co.uk/SEACHEM-PRIME-100ml-Aquarium-Tapwater-Chlorine-Remover-/370415856039?pt=UK_Pet_Supplies_Fish&hash=item563e8169a7#ht_1816wt_901Wait untill you have new sand or any dmsand sifting life will be unhappy with you.
Yep that's the stuff, I have a bottle handy at all times just incase something goes up the creek, which on my side happens quite often

No problem matey! If you can get some cheato at some point as it will help suck up nitrates.