Interesting restaurant just opened today in Carle Place, Minado (a link to their website is below).
I went in yesterday (before their grand opening today) and found a huge (and I mean huge) restaurant with a sparkling new interior and about 20 chefs huddled in the back going over opening day preparations. The list of items on their flyer looks impressive (sushi, teriyaki, noodles, mussels, hot foods, etc)and is definitely seafoodcentric. The lunch is $12.95 (all you can eat, natch) and $23.95 for dinner (slightly higher on weekends). Kids eat according to their height (not kidding).
I cannot vouch for food or quality at this point but if Japanese and buffet are two things you have a yen for, this looks like your spot (unlike the unappetizing appearance of Fukudaya on Hempstead Turnpike in East Meadow, another Japanese buffet restaurant).
219 Glen Cove Rd
Carle Place, NY 11514