The tank install has some options.. you can use the standard spot or do some modifications to move the tank back over the CG. In most cases if you have serious goals in regards to your flying you want to get that tank on the CG. It just makes for a smoother more controlled predicatable flight.

I opted to keep it simple and use the stock location. It's a simple mod to make it fit under the wing tube... if I find a noticeable difference then I will def. sped the time to move the tank under the wing tube.

For me I usually start off with KEs and rolling circle type flying and then as I get in the 2nd half of my flight I hack out some 3D As the fuel is used CG will move back which will be find for the end of my flight.

You will notice the vent line loops around the tank, this makes a trap so when you tilt your plane up with gas in it, it doesnt leak all over.

Make sure you put some foam under your tank