fluval 306 inline co2 and heater setups/ recomendations.

I'm looking to get an inline heater and an inline co2 diffuser for my fluval 306s.

Was wondering if anyone has done this and if you have any recommendations.

The tank runs 2x 306 so I was thinking a heater on one and the co2 on the other.

I have not picked heaters or diffusers yet.

thanks in advance