Your seahare will hide during the day and come out at night. We leave our actinics on for an hour after the daylights go out and we usually see ours then.
I think I have a strange variety this time that only likes glass algae, hair algae and cyano. He's a champ at that stuff, because there is zilch in my tank now. But I worry because he's shrinking a bit and won't eat the algae sheets I put in there. And he won't eat caulerpa or halimeda as far as I can tell, either.
I totally agree with dealing with the root cause of your algae problems. Algae has given me more headaches in this hobby than anything else until I finally gave in and did what everyone told me to do 
I have found that the sea hare will not typically eat the "Sea Weed Salad", but will eat algae wafers and spirulina pellets. And no they do not eat marine plants, calupera, halimeda, brush algae, cheatomorpha and other "desireable" algaes. They do however eat diatoms, cyano bacteria, byriopsis, and other undesirable algae. At first they generally hide until they adjust to your tank, after that they are usually busy all the time. They are however extremely sensitive to parameter changes, so slow acclimation is recommended. When their food source starts to diminish they will hide during the day and only come out at night to conserve energy. The Sea Hare will eat algae on everything, rocks, glass, sand, etc., but focuses mainly on glass and sand. If you have a rock issue, the Lettuce Slug focuses on that. But in the end, get to the root of the problem, lighting, tap-water, overfeeding, flow, etc. The creatures that consume these "problems" are there to aid you, it is up to the hobbyist to find the underlying issue and fix the problem!
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