He wasnt really your friend. Friends are people you can count on in time of need, people whe care. Not just someone that is there. The lack of empathy for you and his disreguard for your feelings is disgustinh, but youth has its disadvantages. I have found A penny in one of my tanks, and lost a couple of fish to a AA battery foind in another tank. Extremely disturbing to me as I am very careful who I let in my house. It can only mean that I have been decieved be a person claiming to be a friend. Personally if I cought the culprit I would have most likly phisically removed him from my house with a "kick" out the door followed by a beating if retailiated against. Im a grown man, my fish are my pets, and everything in my house is there for my family. A mans place in this world is to protect his family. Hurting ones fish is a step away from hurting the family that enjoys them. People like this can grow and change but I wouldnt want them in my house. Sorry for ranting like a loon, hope you keep a close eye on this "friend" as what he has done already is probably less pain than he can cause in the future.
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