there is this reputable tank maker in kelantan lane or road im not really sure.. heard from people that it's quite cheap..
for the DSB, hmmm most people here who have mature tanks, have the DSB and so far, i've only heard of 1 tank crash resulting from a DSB where the PH fell and blew away the sand.. but this would not happen if yopur dsb in in the refugium as there will not be anything strong enought to sift the sand there...
abt the separate compartments, its really up to you.. if u have the space then get separate compartments but personally, if i HAD the space, i would have separate compartments for easier maintenance..
hmmm u didn't ask henry abt the dsb?