I don't know how to prevent Naga leavers though. You get these idiots who never visit the item shop or who are not willing to wait 5-10 min to get their first godly item. Any suggestions welcome.
Alright a friend suggested the following idea:
Start off each Fish with a certain amount of food, say 150. Every second the Fish lose 1 food. When food reaches 0 they die. Every 5 seconds or so a food pickup is spawned for each fish. This pickup adds lets say 30 food.
Now, what this would do is force fish to move around a little. They can still mass a base etc. but have to occasionally leave it to get food.
I was thinking of implementing it as a 'Mode,' and testing it out before actually putting it into the main game.