Hi, i have a 29g mixed reef with lot of lps and few sps, 6 fish and 29 lbs live rock. Flow I have are 2 hydor 600 and a hydor nano 425, my plan is can I just run a skimmer along with a medium size HOB refugium only without a sump or any other filter? The size of the refugium is 18" length by 4" width.