Ive got my lifetech ap3500 return pump,only running the sump now on a 1000l/h pump,and two 39w t5s,planning to add two more all with reflectors,seio m620 and sunsun vibrator 5000l/h,planning to add a scrubber aswell,going with playsand in the DT as substrate,is it really needed to put biorock as base or is liverock directly on the substrate okay?