ok, so i now have 2 cory catfish..they have barbs to help locate thier food, as they scavenge the bottom of the tank..to have those barbs and gravel (it is said, on one website) can harm them as the barbs can get cut on that gravel, and they can get an infection and die.......so sand should be used.
on another website, another expert said, he never saw or noticed anything hurting the catfish..
so screw it, i bought the sand..i had to slowly scoop out the gravel, then vacuum the tank, add water, and add the chemicals.
the tank is a bit cloudy right now, when it clears up, i'll post a pic.
i did not remove all the grave, i left some in a corner for the plant and for the filter pick up tube to rest on, also, both catfish seem to like hiding/sleeping under a plant leaf, on the gravel...
the "kid" at the pet store, showed me the sand he uses in his tank(s)........
if you ever want expert advice on how to do things, consult a 5 year old....
@Stimpy ....knows about 5 year old experts too...!!!!