i agree with all, especially broomer on this one, who in the DAMSEL(LOL), said that, and why, ls is is a very good thing to have in an aquarium, and i was told not to use it by one pet store, he no longer sees me, since i now think he has a couple of xtra holes in his head, i would not believe any one who told me it is not good(in fact, i would change my opinion of their knowledge, in the matter), normally you would hear this form lfs's who cannot get it, or customers of shops who can't, but you will never(99.999999999999999999999999999999976453% probability) hear anyone say that who has used it and knows what it is and does