vacation
I don't know what you have in your tank but I usually try to find someone who can drop by daily. If you have snails in your tank they will eat the nori in no time flat. If you have crabs or shrimps, the nori won't do them any good. I find that using flake food promotes the growth of hair algae and I refraine from using either. If you are not concerned about hair algae then there is no reason why you can't use the automatic feeders.
Hope this helps.
Larry
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