Originally Posted by thinhthan
i have a 55 gallon tank and i building a sump for it its gonna be a 10 gallon sump. after the sump im getting a aqua clear filter and turning that into a refug. would it be a good idea if i put a refug in the sump and the filter? i heard that its useless in some tanks cause its too small or something.
To be completely honest, I see little benefit to a 10 gallon sump with a fuge. If you are planning to use a 10g tank, you will find that you have too little room to accomplish the necessary attributes.
Fuge should be 10% of display volume (ie; 55g tank, 5g fuge)
Sump must have enough empty space to take on the water drop in the event of power loss. A 1" drop in surface level in the display will raise the level in a 10g by 3", add in the volume contained within the plumbing and skimmer and your looking at another 2". That means during normal operation, your sump's water level could never be more than 7" deep. Any more than that and you'll be looking at a flood next time you lose power
The return section will need to have enough room for the return pump to remain completely submerged. If your pump is 4" tall (a fair estimate for a system of your size) then you will need your return section to maintain a water level at or above 5". Any less than that and you'll risk burning out your pump and potentially starting a fire.
Given the above two facts, you will have about 2" of allowed fluxuation in the water level in the return section of your sump. Even if your return section were to occupy 1/2 the span of the sump (which I might add, is now taking the space necessary for your fuge), that would amount to only 0.85 gallons of water. Given the current evaporation rate in my tank, I lose about 1.5 gallons per day. That number varies generally between 0.75 and 3.00 gallons per day based on several factors. That puts you at having to check and top-off your system religiously 2-4 times per day.
Personally, I'd recommend a 30g long for a sump on your system, but you could get away with a 20g. If you cant go that large at current, I'd recommend you go without a sump at all until you can.