What a storm surge might look like inside a sump that’s smaller than display trying to handle the constant flux in and out of water.
That’s on top of the limitations of the plumbing mentioned earlier. Point I’m making is the limitations of trying to go with just one pump (I’ve had the same thoughts) and trying to do more such as keeping detritus constantly suspended to allow it getting sucked up. Although with Tropic Marin now offering a solution to replace detritus naturally falling on coral to provide phosphates I’m having second thoughts about detritus management , again