My aquarium builder has just gone bust and I'm worried conned me with poor equipment so would really like some advise / help about flow rate through a sump.
I've just replaced my 4' marine tank with a new 8'x2'x2' tank. The guy built a sump with three sections; (1) protein skimmer (2) refugium to be used with either miracle mud or sand and caulerpa or chetomorph (any advice welcome) (3) chemical filtration = carbon refractor to roaphos reactor to UV
The return pump is only doing 400 litres per hour (tank volume = 800 litres = 0.5 x circulation per hour). His argument was that the main tank can have high circ but the algae needs a slow flow rate. Is that true? The return pump rate seems REALLY slow.
Also, my chemical filters roa, carbon, UV
etc need 2000 litres per hour and are on a different accurate pump but that means sump water is being chemically filtered 4x (2000 lph) before it is being sent back to the main tank (500 lph) which I think might over sterilise the water.
Really unsure what a good SUMP flow rate is and whether to upgrade the return pump or to downgrade the chemical filter pump? Please help - I'd really appreciate it.