I've not heard that adding nitrate will help an existing Dino problem and I'd guess it would be more likely to make it worse, but have not seen anyone try that I can recall. It will be interesting to see what happens.
Have you tried hydrogen peroxide?
nitrate dosing does make it worse. i stopped dosing nitrate and when it finally hit 0 there was a noticeable "stunt" in growth.
unfortunately... the corals can only tolerate this deficit for so long and dinos can outlast a coral.
there is no 100% solution for this problem.
however here are some tips.
siphon subtrate out entirely and rinse with chlorinated tap water.
less is better than more. i have a similar size tank (265 with 80 fuge) and i dosed 2-3 ml an hour of peroxide on my doser. it kept zoas and such from closing.
water changes should have the 10/1 ratio in the clean salt water. water changes by themselves do not fuel dinos. it only appears that way if your pump is off for 30+ minutes.
blue lights as much as you can. this retards growth significantly. if you can lay off the whites.
dont clean algae or cyano. cyano can outcompete dino if you let it. green algae is desireable if you can get it to grow on a turf scrubber. thicker the better.
uv filter. this "helps" but wont cure it like peroxide does.
ozone... not for the feint of heart. but has destroyed dinos before in other tanks.
reversed light schedule. this is an immediate bandaid but it does work for a week or 2 before their circadium rhythm comes back. then you will have to reverse it again.
good luck
