I would be shocked to see anybody on this forum state anything aside from bigger is better for a sump. If you can fit a 220 gal sump then go for it. More water volume= more stability. More space= easier access and the ability to have a fuge, a skimmer, a place for frags, a... Well anyhow, if you can not fit it then go with the biggest that you can fit.
Now, as for the skimmer (I will duck for cover later) you can keep a successful tank without one. It is a little more difficult, and you need to look at what you are doing, your stocking levels and your feeding habits, but it can be done. I will try to find some links later.
Now for an important part- if it has miracle mud then either leave it intact in the sump or let it cycle for a few months if you transfer sumps. One of the ideas (from what I recall) behind it was that it acted as a deep sand bed- a nutrient sink. If you disturb it you disturb all of the bacteria that breaks down the nutrients and you release gobs of things to your tank that you don't want released. I need to get to sleep, so I will try to remember to get back with some other thoughts...
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Last edited by Dolf; 04-18-2009 at 12:57 PM.
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