Cosmic heart eel is a valuable catch in the Stardew Valley game. This heart fish can be found in the creek during wet days and at night. If you manage to hook a Cosmic heart fish, you can sell it for a decent sum of money. In addition to its worth, it is also coveted by fishermen for its captivating charm. So, grab your fishing rod and head to the streamside to try your luck at hooking this Cosmic heart fish. Happy fishing!