I meant the AC500 could be used to grow macros out of the tank. Certain kinds of macros can and will smother the livestock in your tank. Having it separated gives you a better measure of control over them. BTW, you don't need an extra light if you place your main lights correctly. I had a AC300 fuge that was light from the excess light of my former 2x96watt pc system and it worked just fine.
Noticed you edited your post, good call on not making your tank a purely money tank.
-Rich
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