I own a pair of red parrot fish and two pair of severum fish in 20 gallon tank. Excel red is good for red parrot fish I know.and no idea for severum fish.

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This is a interesting question (http://www.marinedepot.com/), according to me their is no any special effect due to this but if you want to take reference more you can visit Aquarium Supplies, Fish Aquarium Tanks, Fish Supplies, Aquarium Lighting and more! (http://www.marinedepot.com/).

OK I'll check with that.