1) I have a Pro II, which should be similar. The water flow is controled by the handle which is also used to disconnect the water in-out adapter. Just turn down the water flow will do for a small tank.
2) should be able to connect more than one tank using a T connector; however, you will run into the risk of leaking. Not to say your CO2 will be used up much faster. For example, M3 has a 1 CO2 cylinder to 6 tanks Hexo-Manifold.
http://www.marine-monsters.com/front/pr ... l#metallic
3) can't answer that, never use one before, however it said to have a better bio-filter
I will let other "high-hand" continue on...
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