They look like bits of plaster but they seem to have food in them. I don't know how good it is or how the fish know when to look for it but at least the fish survive while you travel. The battery operated timed release ones are probably a better option since you can feed the same food as usual and they hear it so they know to eat.

Pros: keeps them alive

Cons: not sure how tasty it is

Thanks to this wonderful fish feeder, I was able to go on vacation without the fish dying. Thank you for creating this.

Pros: None of my fish were dead.

Cons: Nothing.

this is really a great product if you are leaving for a vacation and you want to makle sure your fish stay fed!?

Pros: healthy

Cons: no cons

I have used this before it is great for those get aways and none of my fish have died while I was gone.

Pros: great for those get aways

Cons: ""

It keeps my fish alive, so I like it.

Pros: keeps fish fed

Cons: none