Hi jay,
The tank In the pics is not my tank (i didnt post any pics lol) But anywho.. I beleive that your blue is originaly went to a led, and seeing as you said you dont have any led perhaps just ground it and it should work, m just as electrically challenged as you if not worse lol...so im not sure how to help you anymore mate, i wish i did hopefully some one comes in and can answer your question better if my suggestion dosent work, WHen i stripped out my tiger i left as much connected as i could so i wouldent have to try to figue out as much
Jonathan