To my wonderful extended RV family. Thank you all for your responses. After a lot of thinking and hair pulling, I pulled my tank and cleaned the heck out of it. That was quite the chore considering my TT has a sealed underbelly and I have never done this before. My wife wants a new tank, so I called a half dozen places before I finally found a person to talk to and ordered a new tank. In the mean time I put the old one back in case the new one doesn't arrive before our trip from Virginia to Montana.
After some research, I found the original owners had well water and never treated, or emptied the tank since they had installed an aftermarket filter between the tank and pump. This is why I think the slime was growing in the tank. I have learned a lot from you all and I will be bleaching my system multiple times a year. Again, thank you all for your support, guidance, and teachings. Until the next time this newbie has questions, I will talk to ya later!