Dude, as much as it sucks just let it happen. Get him to clean the tank and show him the ropes. I have bought my bro so many things for fish to try to get him into the hobby its not even funny. Try to embrace it, and really teach a younger one the proper way of keeping. I bought my brother a 90 gallon sw tank with filtration skimmer stand etc, and even a 14 inch bamboo shark and a 6 inch bamboo shark and a purple tang. He still doesn't clean tank, or feed them for that matter. I wish my bro would take an interest like yours
thats not including the 3g, or the 55g. This is what he ultimately wanted.....