Tank Problems

[Rossf1]

Hello,

I have a 90 gallon tank. I recently last two months slowley converted the tank to saltwater.

My tank in now full salt, salinity 1.018-1.019

I am having a problem with amonia ad Nitrite. Both seem to be really high.
I use prime to lock the amonia and keep fish from getting sick.

Last night I tested nitrite and the leverls were pruple (5) on the card.
I did a 25% water change and then thested again this morning. Exactly same reading.
I did another 25% water change this morning.

When adding my new saltwater the tank totally clouded up and looks milky white. Levels still high, have not changed.

my filters are eihem wet dry cansiter and eihem professional canister. No sump at this time.

Help how do I lower my levels? How do I keep my water from getting milky white durng watr changes. That never happened in freshwater.

Can I prepare my new saltwater and store in a 100 gallon barrell till im ready to use? How long can I store it for?

I ned help, I have no idea how to fix this.

Ross