Well after looking at most of the opinions on these boards I got most of my ? answered I'm getting a 125g or 180g put in 15 inch long red belly (Natteri) Piranha in the hopes of haveing in the end 8 to 10 full grown for breeding is it best to get them from different baches or the same and as far as filtration what would be the best wet/dry or canister and why I've had them(Piranhas) before but never had a goal in mind any helpfull hints would be great?