+1^ All mushrooms hate med-high current. When I got my first 2, theydetached themselves from the rock and floated away. I thought they were dead, but I found one attached to my rock in the back of the tank, thriving. They will shrivel up and occasionally one may not extend again. I have a ricordea that will not open up because I had him in a tank with moderate flow. I took him out and put him in another tank and he is still shriveled up under low-very low flow.