Hi, I have a Biocube 29AIO, and if I was to upgrade I would buy the RED SEA MAX E170,a two foot 170 liter /45 gallon aquarium with the dimensions of 60cm x 57.5cm x 55cm (24” x 22.6” x 21.6”). The MAX E170 will ship with a single Hydra 26 HD, the MSK-900 protein skimmer drawing 250 liters of air per hour, and one filtration pump pushing 2150 liters/ 570 gallons per hour.