Ok so two days ago I cleaned out the overflow. Got most if not all junk out. I then dried the overflow top and bottom. I let it air dry yesterday and today I installed the new bulkheads. I have to say these new bulkheads are 100x better. The other ones I ordered off of Amazon and I ordered threaded. The seal seemed thin and odd (I didn't realize until I took them off) Also all was open to the air for months. These new units I picked up from Ocean Aquarium and each unit was sealed. I also went with slip this time. Not only were these units sealed the deal was also thicker and larger making a nice seal. Tonight I installed the bulkheads and did a water test. Water only came down the correct part and not between the head/glass. . Next is going to work on the piping again.