On my 45 Gallon Tank I currently have 2 old filters, one rated for tanks 45-60 gallon and one rated for 20-30 gallons. In December around christmas, I want to upgrade these old filters and get a newer model. I was leaning towards an Emperor 280 or 400 but some users on here pointed me towards the AC 110 model. Would an AC 70 be sufficient filtration for my tank by itself or even combined with the smaller of the 2 filters on there now? I will have a pretty good sized bioload when these fish get full sized. While I wish money wasn't an option, it will end up being an aspect of my final decision. Out of the 4 choices I listed in the poll, what would you guys choose and why? I appreciate the opinions, fortunately i still have a couple months to consider this.