Hi from Malaysia. Had a SW tank back 9 till 4 years ago. Sized 4x1.5x2. Switched to planted tank earlier this year nd now back with a nano tank for a SW tank again. made a weird order now thinking da heck did i just ordered and received. 1x1.5x1.5 tank with a back sump. Well back to square one now i have forgotten many of my basics.