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I've heard you can feed fish special food, like bloodworms, but also worms, and vegies.
What do you do!?!!?? ???
Veggies can be boiled/microwaved until they sink, and then just dropped in. Get a lettuce clip for lettuce. Veggies are great for catfish.
Feed bloodworms occasionally as a treat.
I know what can happen if you give fish too much bloodworm...
"Why can't I poop!" :
Depends on what kind of fish you have whether they will enjoy veggies or more meaty kinds of food.
About once a month give a slice of cucumber to my fish - they love it - especially the plecos - they can't get enough of it. I think it really does them good.
Even if your fish are carnivores, it's good for them to occasionally feed them veggie flakes or pellets if they will eat them, like once a week. This will keep them regular, and it won't hurt them to eat veggies once a week!