Sump filter

Question
Hi Will,  I have an opportunity to purchase a tank around 80US gallons with an option for a sump filter built in the bottom of the cabinet that houses the tank.  I was told that this is not such a great idea because of the overflow of water when the pump stops working especially in absence of power.  Can you comment on this.

Answer
Hello Munaaf,
Many of my aquariums have sumps like this. Before I help you, I need to know what type of sump you have.

The most common option here in the USA is an overflow system. This is a large plastic box in, or hanging on the aquarium with holes drilled in the top, allowing water to pass through, much like a skimmer. They have drains leading to the sump in to bottom or on the side of the overflow box. This is a very good option for a sump, and I will teach you everything you need to know about it if this is the case.

The second option is a "false bottom". This s where holes are drilled right into the bottom of the aquarium. If this is what you have, do not get a sump, no matter what. Because of the drainage system there is nothing to stop the entire tank from draining into the sump and overflowing onto the floor once the power goes out. I personally do not like these tanks for this reason. If this is the case, buy a canister filter insted, as they are closed systems and will not overflow.

Sorry for any inconvenience.