Mushrooms can move and will find a spot they like, what I usually do is place them in a spot with partial shade very close to direct light so they can stretch to the light if they want to. From experience if the animal is healthy and likes where its at an individual can put out a couple babies a week. Once the babies mature the whole process is exponential and is limited only by available space. I've found low to moderate flow and indirect lighting to be best ( depending on what lighting you have) under my MH indirect is best, under T-5 indirect, PC never used it so I cant say, but with 96 watts on a 10 gallon I would guess indirect, VHO and NO flourescent direct or partially shaded depending on depth of tank.