Hi all i have a 300 liter (65 UK gallon, 75 US gallon) Tank. I wanted to keep Delhezis , how many can i keep and i don't have the room or money for an upgrade in tank size. The footprint is 121 x 48 x 60 Any help would be appreciated , as there are conflicting views on tank sizes for the Polypterus. Thank you all. 