But here's my advice:
You don't want to feed it A LOT of snacks, obviously, but they are a quick way to fill your Ocean's hearts. Quite a few people I know tend to resort to snacks when their Ocean becomes unhappy, but there are alternatives, too. I don't feed my Ocean snacks anymore if I can help it, but after the adolescent stage, I tend to get away with it on the odd occasion.
So, here are my tips:
- If you feed your ocean only 1 or 2 snacks over a long period of time, probably make it about five days to a week, then that is absolutely fine.
- If you want to fill the hearts on your Ocean really quickly and don't have much time to tend to it, then feed it up to four snacks and work off the weight later.
- If you're nervous about feeding your Ocean snacks, then play the game with it instead.
- If your Ocean calls for empty happiness hearts, don't worry. You don't need to fill them up immediately as they don't empty as quickly as the hunger hearts.
- ALWAYS FEED IT MEALS! If you don't feed it meals it will eventually die of hunger - you don't want that. Meals won't affect your Ocean's life expectancy (or rather they will - but in a good way) and are required to make sure it stays in good health.
- Don't feed too many snacks! It's true that only 1 snack won't do any harm but a ton of snacks is bad. If you feed it, say, 50 snacks in 1 day that could greatly reduce its life expectancy.
NOTE: This only applies when out of the baby stage; since Planktontchi won't gain weight regardless of what you do, feeding it snacks in this stage won't affect life expectancy. When it evolves into Kuragetchi however, you need to be more careful, as this is when feeding too many snacks might be dangerous.