yeah clams are prolly the easiest thing you can breed, yet they're worth some money in bulk. 1 clams, yes 1 clam can have 100,000 babys in its lifetime. Online the cheapest i could find them going for was $1.50 each. so you could sell them $1, that $100,000!!! no jk you'll never bee able to sell that many but still you can make quite a bit if you have someone or some store buying off of you. jackdaniels yours prolly died because they are filter feeders, if there isnt anything in the water thats tiny they can snatch up they'll die. like if i feed flakes, they'll end up eating the dust that comes off of them. the downside to clams is if any die they're baried in the gravel and you can find them, therefore u get cloudy water. good luck