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That's a good question.
You'll notice in nearly any fish that it mouth will seem to point either upwards, downwards or straight ahead.
Fish that feed on things like insects and things that fall onto the surface of the water in the wild will almost always have a upturned mouth to make it easier to feed. A good example of this is the Betta.
Some fish feed on items as they sink to the bottom or prey on other fish. Most of these fish have their mouth straight ahead.
Then you come into the bottom feeders. Many fish like algae eaters and cory cats forage the bottom of the tank for food. Because they eat off of the bottom their mouths face down to make it easier to eat.
What else can I help you with?
How much food do I feed my fish?
You can feed a small pieces of fish food
What to feed a fish?
Fish food
Is the food you feed to fish poisonous to kids?
no it is not it depinds what food you feed. like if you feed it other fish it is poisonous if its not cooked thats my answer
What do you feed tiny fish?
fish food
Can you feed crabs fish food?
It depends to what type of fish food.
Do you feed creek fish beta food?
You can feed them most fish food, they aren't picky like betas.
How do you feed my fish?
I would have to get to your place and access your fish to feed them by adding suitable fish food to the surface of their container.
How long should you feed a fish?
You should feed your fish about a pinch of food once a day.
Can you feed wild fish normal fish food?
Yes.
Do cray fish eat fish food?
yes, crayfish do eat fish food. i feed my crayfish fish food all the time
Do cray fish eat fish-food?
yes, crayfish do eat fish food. i feed my crayfish fish food all the time
What human food can you feed fish?
nothing
