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my fish are dying?

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I got this tank about 2 months ago from my sister... she gave me a goldfish... I added, 2 black moors and 2 calico colored fish.. I lost one fish for an unknown reason... Then the goldfish died (I read I was feeding them too much so I started a feeding schedule one pinch every other day) and the remaining fish were doing fine... But then I decided to clean my tank out... I wash all the rocks, washed their toys, cleaned the filter.. And while I was doing this I had my 3 fish in a small fish bowl... I added the water and the chemical for deleting the chlorine, and I acclimated them... I came back 2 hours later and the two black moors where dead.... The remaining calico is kinda just at the bottom of the tank still swimming but not too much... What should I do? And what did I do wrong?? (Ps I didn't use any soap while cleaning any of the fish tank oor toys...)