1st off, this to be my first native tank, The current plan is a 37g. I wanted to go out to my local lakes and collect everything for the tank, rocks, wood, plants, this i've done for tanks before so i shouldnt have any issues. My real question is would i have any problems placing mud/sand from the lake as an all natural substrate? The only problem i could think of would be too many nutrients in the soil that would cause a perminent algae problem, is this a possibility? and has anyone tryed this before?