Yeah, man. I get kinda depressed when I check on my fish and there's a ton of dead babies on the bottom. I feel like a bad mother! I had some Oriental Swoopers for a hot second, and then I apparently overfed them and I saw them die right before my eyes -- trippy! But don't give up! I just found a magic fish, and have made enough dough to buy all the equipment. I highly suggest finding a breed or two that are highly profitable (I am living off the Hornet Goldbulbs at the moment) and exploit the heck out of them until you have money to advance your environment.

Aside from that, don't worry about winning. Just have fun!