Please look at this. If you have CUC in the tank - please rise the lighting in order to make the algae grow. You will probably get a good algae growth in a matter of days. Because you do not have any corals - you can just turn down the light if you get to much green algae and let the CUC eat the left over. When its OK again - full light again. The urchin eats algae - the sea star mainly organic detritus and some meat - please see here.
If you can get one or two small living stones - I think it would help. And if it is some growing on them - food for your inverts
Sincerely Lasse
If you can get one or two small living stones - I think it would help. And if it is some growing on them - food for your inverts
Sincerely Lasse
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