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Can someone please tell me what kind of fish this is? He is at petland and I was wondering if I would be able to rescue him and put him in one of my tanks.
Pseudotropheus socolofi would be my guess and I commend you for wanting to rescue him (god knows I've had hundreds of those) but I wouldn't add him into a display tank without a lengthy quarantine in a tank to himself, he clearly has health issues ranging from a birth defect or fish TB.
I would use your empty 20g tank to QT him, get him on a quality diet(such as NLS) and treat him for internal parasites with either medicated food from Angels which is the best method or the use of a powered form of Metronidazole added to the water, I'd either recommend API's General Cure or Clout by Mardel.
Good news, my friends daughter now has a new 20 gallon tank and pretty white fish for her room. It was her bday today and couldn't think of a better present for her and her dad.