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I have been using this LED light system for about six or so months on a fresh water planted system.  I'm not sure how well it would grow corals but I would assume softies would grow okay with these lights.  I like the light system over all but I would like to add another light fixture because completely coverage isn't obtained with one of these fixtures in my 75 gallon aquarium.  I think a 55 gallon would be fine with one light because of the smaller depth of the tank.  I have the lights towards the back of the tank where the plants are so the front of the tank becomes a bit darker.  I do love the shimmer the lights put off like metal halides do.  Also these lights are very energy efficient and produce very little heat.

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We recently had the opportunity to try Petchup®, a tasty and nutritious condiment for dry dog food, with three of our dogs.  The result was waggin' tails all about!  Three out of three dogs absolutely loved their food with Petchup®.  Generally when they are given only kibble they tend to not eat it all.  With Petchup® they didn't leave a single piece of kibble, not a single crumb, and they licked their bowls clean.  Then they went to each other's bowls and licked them clean again.  Now when they see the Petchup® bottle coming out they  know they are in for a special treat with their dinner.