Stealing Goldfish

When I was in middle school, one of my friends tried to convince me to steal a fish from an aquarium shop in our neighborhood.
I told him off ("condemned" is too strong here). I said "Look, Türker. This is a sin. Please don't do this. Shame on you."
A few weeks later, while we were playing, Türker and some of our friends gave me a glass full of water and said that "wait on the corner of the street". They did not reveal what they were going to do. I thought this was a new game. I went to the corner and began to wait. Approximately ten minutes later they came to me. One put his hand into his pocket and pulled out a goldfish. I had figured out what the purpose of the water glass was when he put the fish into the glass in my hand.
Each of us had a fish tank. But we didn't have space for a new fish because of we didn't have enough money.
The brother of owner of the aquarium was our friend. We used to go to each others home. But we were afraid he would notice our new fish and take it back. He could take back our or their fish from us. Worse still he could threaten to tell people what we did.

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Very good! Just a few stylistic errors which aren't major. What happened in the end?