Natural blood fountains

In my fictional world there are small organisms the size of a dog or smaller,some have the shape of mini-volcanoes, while some are stuck between rocks, they don't move and live in both sea and land.

This organism doesn't have natural predators as not being edible, it's as hard as rock and isn't killed by the digestive system of any animal.

However it releases a waste product, it's a red liquid similar to blood and some animals feed on it, if they find one while it releases it's waste product,some other colonial organisms farm them just like ants farm mushrooms on earth.

If animals feed on it, then it might be nutritious and contain minerals or other things... so what reasons does this blood fountain have to give up this nutritious liquid?

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Natural blood fountains

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