IMO 40-60 is pretty high in a coral tank. Maybe no problem in FW ,you are going to have an algae issue and unhappy corals with levels that high in marine.
I am working my nitrates to under 10 presently with hope of under 5 soon...
Most reef tanks keepers shoot for lower then me..
Are you running a protein skimmer ? Is it doing a good job? They are very important to reef set ups IMO.
Getting it down ; water changes [no fun and $ in a 180], possibly purigen may help if you added enough, or even bio pellets in a reactor .I have just switched from bio pellets to carbon dosing. I am adding 20ml of vinegar everyday to my 120.It may take a while for the bacteria to build up but soon enough I will have control over my nitrates by how much carbon I inject. You must have a skimmer for bio pellets or carbon dosing.