I need some suggestions on what return pump i should use, it's going to be an internal in a 10 gallon sump returning it to a 20 gallon tank, i need to know what good GPH would be. Thanks!
That is unless you buy a larger pump on purpose add a "t" in the line with a ball valve after that to allow you to dial the water flow to exactly what your overflow will handle! simply plumb the extra water back to the skimmer section (or refuge if you put the pump in the middle section) and the excess flow allowes the water to pass thru the sump an extra time for added filtration.
the only real way of moving is by using the good old buckets and tubs...fish wise, keep them in buckets of tank water...corals, keep submerged in water when removing from the tank and move the live rock they are attached to with them....live rock, stick it all in a tub filled with tank water..sand, personally, i would start off with a new sand bed and just save a few cups fulls to spread over the new sand to seed it...
Undoubtedly, you are going to experience a mini cycle, how big of a cycle will depend on whether your choose to use new sand or move the existing..Moveing the existing sand will cause a far bigger cycle to appear as you will be stiring all the crap and gunk up which has been locked away in the sand bed...hence my suggestion of using new sand...
can i ask what reason it is why you want to pass on the macro algae in the sump? just out of interest..
Yes, adding live rock rubble and a deep sand bed of about 6 inches is certainly, in my opinion, a great move forward. It benefits the system as it acts as a slow filter as water passes through the sandbed and live rock at a very slow rate giving the water far longer contact with the suface area..which also applys to the macro algae we have in there...there are many benifits of having a fuge configured as i have just spoken of and will all aid you in keep a more stable system...
sand in the fuge? Personal preference..some people just use reef grade sugar grain size, others have a mixture of different grades of sand grain...
hope this helps a little
Niko