I have a 3 to 4 gallon refugium. I have it setup with a DSB and have live rock and marco in it. It also provides a nice coral nursing area when you want to frag a coral and keep it under low flow.
yea that would be great... only problem is it wont fit under the stand i got . the stand is exactly the size of the tank but i plan on geting the 15 gallon tall that fits the same stand/light and using the 5.5 gallon under to add about 10 more gallons wich is doubling water volume so it souded like a good idea