Best size frag tank?

[Motomatt86]

I'm looking to start a frag tank and put it next to my 180 display. I think I want the tie in all plumbing so I have one system. Thoughts?

 

[Chameleon]

40 breeder

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[WesF]

I like the deep blue rimless frag tanks. I have the 60g (48x24x12) and love it. The smaller 30g is nice as well (24x24x12)