Price on Inquiryaquarium. Red Spotted Severums require an aquarium of 55 gallons for a single specimen, with a pair requiring 75-90 gallons. They should be provided with a fine sand to smooth gravel substrate and a few structures for shelter (driftwood, rocks, and vegetation) and at least one cave. Live plants are greatly appreciated, but do not always last long unless a prolific species is used (Anacharis, Cabomba, Hornwort); although omnivorous they have may pick at live plants and vegetables.