Do i need to give supplemental food to inverts

i no longer have an a algae issue, all my GHA is gone, and i only have a couple bubbles of bubble algae on my sandbed, and i don't have any cyano. The only algae i really have now is like a film algae on my glasss.

so now that the algae is gone, do i need to give supplemental food to my inverts. I'm mainly thinking about my urchin, i really don't want him to be eating the corraline, and i'm not sure about food for the crab, i don't think he will find the bubble algae that's on the sand. So should they be able to find stuff around the tank or would i need to give them food?

 

im assuming your talking about emerald crabs and i dont think so but i dont think it would hurt to put a little nori in the tank

 

yea emerald crab. I think i might give the nori a try, i just mainly worry about the urchin, i have a lot of coralline growing, i know they poop it out and cause it to spread again but i don't want that to be his last resort for food, even though he goes all over the glass, window screen and equipment, but i prefer him on the rocks

 

the nori will really foul up your system if you let it dissolve before your inverts can eat... makes tons of cyano and algae in your system

 

didn't know that. maybe i'll skip on the nori then