Depends on the mushroom.....I think ricordeas need a little more light then lets say a red mushroom or a rhodactis.....I have them under pc's, T5HO's, and Metal halides in all different places in the tank
well my deal is i had them on the bottom but after i got a green carpet i decided to move them they havent been happy so far. i have them under 2-250 metal halides with 4-54wat pc. do u think i should move them back towards the bottom. also im not sure what kind they are but they are red with green strippes in the middle of them.