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I don't know how to tell which sponge needs light. Is there a way to tell. Trial and error on placement doesn't suit me but I usually go that route . It's great when a sponge just appears and happily grows without my involvement . I want to get those orange sponges that are Caribbean . Those ball and finger sponges that I see on KP Aquatics or live-plants.com . I am thinking of putting them in my fuge but I dont have uv light down there or blue spectrum . I don't know whether they survive . I see them orange or red so I assume if they have algae with them they are reflecting that spectrum .
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