Just an update all is well with the fire eel the decoration was the problem. He is doing very well every time we walk near the tank he comes to the very top and swims around like crazy begging for food. He isn't shy at all, he barely ever hides mostly when he's resting and surprisingly he is active during the day. The pleco and bristlenose are still in the tank, and no issues have come up. All of the eel's white damage to his scales and slime coat are gone, I monitor the tank daily before and after work, if I see any problems with the sucker fish, I will get rid of them.