Okay - thanks everyone.
Yes, I too have the national geographic sand in one tank and they are kewl with that. However, that is normal aquarium sand. I am talking about the hardware store black blasting sand.
Well, it is too late as I already got the eco-complete with a coupon. I got a refund on my one 2.5 that broke and bought eco-complete with the money. The lfs assured me that the little froggies are fine in eco-complete.
This is my first venture in eco-complete and I like it so far (um, straight out of the bag..hmm.. what do I know.)