Hey kali, i was wondering what type of Co2 set-up you have purchased. I got my fist planted tank (180 gal too) up and running and i was still a lil fuzzy on which Co2 set-up to go with. Im also using a FX5 and a 970 gph sump. Also what type of media are you going to fill the 3 FX5 trays with!?!? Thanks and good luck!