It looks like the pump pushes water up and it then flows down through the media. It should work fine, just not a common type of filtration here.
If you aren't adding CO2 it isn't going to have any negative effects. Only when the CO2 level is elevated above the normal equilibrium will too much agitation cause problems.
If you aren't adding CO2 it isn't going to have any negative effects. Only when the CO2 level is elevated above the normal equilibrium will too much agitation cause problems.
