Hello everyone, My name is James and I am new to this site, Not quite sure what I am doing or really how to navigate this right now so all I know to do is start a new thread, If I'm doing this wrong, please feel free to direct me to where I need to be or what I should be doing, I have a 75 gallon reef tank I started about 3 to 4 months ago, when I started it, I started with 150 lbs of live white aragonite sand from ebay, and 75 lbs of live Marco rocks from ebay, I cycled the tank with a canister filter, everything was going great, all the way through the Diatom bloom, I bought a rock from Petco that had 2 hitch hikers in it, a 3 stripe damsel and an indigo dottyback, both survived and are still doing fine, so the tank cycled, I added a clean up crew, 100 cerith snails, a sand sifting starfish, 4 blue leg hermits and 3 red leg hermits, and 5 turbo snails, all was still good, I bought some coral, the corals done great for a while, My problem started when everyone started telling me how I needed a sump/refugium, I decided to go with a refugium, I built a fuge and used the wrong silicone, My water quality started getting bad and coral started getting bad, next day I tore the sump out and re did it with the right silicone with 2 40 gallon water changes, I installed the sump again, added 25 lbs of live rock from marco rocks, and 35 lbs of live sand from petsmart, Nitrites shot up to 5.0ppm, I lost all my coral and my entire clean up crew, This was about 2 weeks ago, I have been fighting nitrites and ammonia ever since, no algae, all my fish are fine and eating good every morning, I have the 3 stripe damsel, the indigo dottyback, a yellow tang, a humu trigger, 2 osc clowns, a lawnmower blenny and a scooter blenny, they are all fine, But now I am starting to get diatom bloom again, Would you say my tank is still cycling? or is it close to finishing? what do I need to do? I have tried several bacteria in a bottle, but none has helped, I have some dr tims one and only coming, I was going to try that, I don't know what else to do, I just want to save my tank and fish and get it back to normal again, I am wondering if the refugium was even worth it now, Please help me.

Thank you for reading all this, I hope I can get some good advice.

Best regards: james