So i have this 22.2 US gallon tank and i want to make it a reef aquarium the problem is i have a very small area in my stand because of the pillar in the middle , its split the are in half exactly 22cm * 28cm , so im wondering if that is enough space for a sump setup and i think to design a pump that will look similar to external filters .. So any ideas ?

but will take your advises in concern .

