Feeding ?

Okay I just added a cleanup crew to my 75g..... What I am afraid of is that once the algae is gone and I don't have any fish in the tank yet should I be supplementally feeding them? I haven't seen anything about feeding other than they will scavenge for leftovers from feeding the fish. Should I add some dry seaweed such as Nori occasionally and maybe adding some fish food to give them something to chew on? There are about 50 hermits, 50 mixed nassarius/cerith snails, 25 nerite snails and about 12 mexican turbos and 5 peppermint shrimp.
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You could add a very small amount of food. I would use a meaty food instead of something veggie

J

 

using a Formula 2 would be great since they come in little cubes just chop it up real tiny and only put a few little piece in. Then store the rest away.

 

for the crabs, what i do is push some nori/seaweed selects into the sand and then the hermits climb and chomp on this all day. as for the peppermintshrimp add some fish food and they will love that...for the snails...well those r gona be tough..hopefully they will get the left overs from the shrimp.