For all practical purposes the answer is no.
If you mean to ask if fish are harmed by lettuce, they are not.
If you mean to ask if fish will eat lettuce, the answer is no for virtually all fish, but I would not be terribly surprised if there were a few species that would eat lettuce.
Fish are generally not vegetarians. Even those that consume plant food would want something with more carbohydrate or protein than lettuce.
Yes
what are you doing with lettuce and snails? and no they will be fine
Yes, this is correct many people called 'space farmers' have to almost fish the lettuce out as when lettuce is in space the lettuce can move at around 30mph.
No unless you wanna wash it .
Yes, but not too much-there is a lot of moisture in lettuce.
Romaine lettuce is the best but don't give lettuce too often. All it is for them is water, there are no nutrients.
It is not recommended that you do so. Whenever possible you should try to give only fish food to your goldfish. Don't give it food that you eat because it could kill them.
Yes!Betta fish are omivores so it won't be to bad for them so i might as well say yes!
They eat it.
I give my hamster lettuce, celery ,spinach, carrots ,and other leafy greens.
Yes, lettuce rots in water. This is the first stage of the culturing of infusoria, a microorganism used frequently to feed fish fry.
Cheeseburgers with pickles, French's mustard, and shredded lettuce