I I went to a friends house and saw they had a fish tank. It was a 10gal tank that was only filled up halfway with dirty scummy water you can hardly see through. Random items have fallen in and the filter was clogged with crap! I don't think it has ever had a water change or a fter change for that matter. I think the poor guy hardly gets fed also! I need to rescue it. I yelled at her and said I was taking the fish. I couldn't see the fish not only cause of how dirty it was by also it stays in a cave. I did see movement so I do believe it is alive. She said its some sort of cichlid and believes it looks just like my black convict. My question is how is the best way to get it to adapt to my clean tank. I have a 55 with a convict a Pleco and a jd. I think he will be ok in there but it might be a shock to his system to have clean water. And she said he is aggressive but my fish are pretty mean as well so I want to try to add him for his safety! Help please!!!!!!