Hi, Currently my tank (a 72 bow front) reads 0 for Ammonia and Nitrite but the Nitrate is very high. The level is 80-160 ppm! I have tried water changes, I have cleaned the protien skimmer collection cup and have cleaned the bottom of the tank by taking out any wastes. I also have removed the algae on the bottom of the tank and on the glass. I was wondering if their were any fish besides damsels that would be ok if introduced into a tank that has a high nitrate level! Currently their are no fish in the tank! The fish I am mostly interested in are puffers and lionfish! Thank you!