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I'm sure ours wouldn't clog either if we changed them 2x a week! We don't change them quite so often (though you should, so keep doing what you're doing).
As a sole proprietor you can either go S-Corp or Corp (as LLP/LLC isn't available to a sole proprietor). The difference will be the way you are taxed. As all personal income (regardless of what is left in the business for growth) or double taxed via Corp (business taxes & personal tax on monies...
If you place them 2' apart that's going to make your openings for doors 18-20" wide. I know we have some engineers & builders here (hint hint), but IMO that's too close together. Hopefully they'll chime in. On the ends of the tank the gap will only be 17" wide.
Sure. Your tangs & other herbivores might eat it before it can grow, and you'll want to keep it from getting out of hand (though as a slow grower it probably won't be difficult).
Re: Here's my 120
I would think that with both of the pumps feeding the same manifold you would have some clashing of the flow. It seems to be that it would cause some turbulence when the outfeed of one hits the outfeed of the other looking for that "path of least resistance".
I'd personally...