I'm in need of some help/guidance, let me give you a quick background of where I'm at and whats going on. First I have a 36g bowfront tank 2 years old, 50lbs of live rock, 2-3" substrate, HOB Reef Octopus Classic 100 skimmer, HOB filter running carbon cartridge, 2xhydor 565gph powerheads, 300w LED. Tank has been great for the past 6-8 months no elevated numbers except Nitrates when I would go longer than 2 weeks for water change. Marine life is several inverts, 2 clowns (medium size), 2 banggai cardinals (medium size). So 4 weeks ago I got more serious about the care of my tank and wanting to put more into to prepare to add corals soon. So I did a water change and decided to pull the skimmer off and clean it for the first time in 2 years. Another additive in the same week my wife got a Fluval EVO 5g and I took a small rock (5lbs) out of my tank and placed in hers to help cycle it. A week later I was preparing for a water change and noticed my ammonia levels were elevated .25ppm per API test kit. Did water change (10gallons) waited a day and no change in ammonia, did another water change 2 days later and no change. So I waited a week and did another water change (15gallons) and still no change showing .25ppm. November 22nd I tested the water and it was now showing .50ppm so I started using prime to lock ammonia. Did 3 more water changes the following week and it would go down to .25 for a day and back to .50 after a couple hours. So last Saturday against better judgement I bought a beautiful large Diamond Goby at LFS for a great deal Black Friday Sale. After introducing the Goby it went crazy in my sandbed stirring all kinds of stuff up, but awesome to watch him. So I checked my Ammonia daily and have noticed it continuously going up since then with a water change daily (10gallons). It was at 1.0ppm last night so I added more prime up to 5x as it says on bottle and tested levels today and it shows 8.0ppm! My nitrites are 0 and have been the whole time and nitrates are 10ppm. All my fish look fine, eating, swimming as normal, so could this be the result of prime in my system making it show elevated numbers. I have a seachem ammonia test kit coming in the mail that will allow me to test free ammonia but in the current time what should I do? Also what started this ammonia increase from the beginning, cleaning skimmer, removing small rock? I'm nervous that I may lose my fish if I cannot resolve this and just to throw it out there in the past 4 weeks I have done over 150gallons of water changes with no help. I'm exhausted with the water changes it seems its been all my spare time these past few weeks, so any help would be appreciated, thanks.