so i started my setup. I have a 125g tank i put in a thin layer of CC for looks will be adding some live sand this weekend. I have a like 15lbs of live rock ATM and the salinity of the water is perfect. I have to HOB emperor 400s and a fluval 405. The emperors are using Activated carbon and a a sponge. and the fluval has bio balls and the sponges. the tank is crystal clear so far. only been week. i will check nitrites/rates this weekend as well. I am thinkin of doing a sump but im not sure. I ddint buy any of the last filters as i had them previously. the sump seems like a such a great way to get it done but i dont have much space under my stand. what size container would i need fora sump? if i did a sum can i get rid of my other filters? thanks.