a piranha knock over a rock ? good luck piranha.Foster;4447646; said:More likely they will freak out and knock the rocks over. I wouldn't do it just because a large sharp rock into the side of your tank could be a spendy problem to fix. Things for them to hide behind and out of eachothers path directly is more of the point IMO.
Rocks are HEAVY last i checked. Assuming you place it so it has a decent area sitting flat on the bottom i don't think a piranha will knock over anything.
For god's sake some of the suggestions i've been seeing on here are absolutely rediculous today (not just the piranha forum) what the hell have people been smoking today ?
