Mar 16, 2016 - (Tetra Whisper 60 Air Pump ManualWhisper Model 60 – suggest.). Cool air/sponge filter setups though for bigger tanks. Regent30-60 impeller.

30 gallons of water weighs 300 lb and then there is the weight of the aquarium itself and accessories - that is a lot of weight that is likely to distort even a robust cabinet if it isn't standing on a perfectly flat and level floor, the most common reason why cupboards, cabinets and chests of all sorts never seem as good at home as in the shop. Another possibility if the unit arrived as a flat pack, perhaps the attention to detail during assembly was less than precise. Answered on Jan 01, 2019.