Doesn't matter which powerhead model. The larger the powerhead the more flow it will probably cause. A 400 would be fine. I think that's what I use.
Not sure.....maybe a few weeks on a tank that size. I wouldn't expect it to last longer than a month on a 55g.
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*Kristin*
5 Planted tanks:
55g, 40g, 29g, 10g, 5.5g
10g N. multifasciatus tank, 5.5g Platy fry
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