A 7x5 aquarium has a total volume of 175 gallons. Based on the adult size of the fish you listed, here are their minimum tank size requirements:
Mbu puffer: 125 gallons or larger
Temensis peacock bass: 150 gallons or larger
Silver arowana: 250 gallons or larger
Motoro ray: 180 gallons or larger
Longnose gar: 125 gallons or larger
TSN (Tiger Shovelnose Catfish): 180 gallons or larger
Pinima bass: 75 gallons or larger
Based on these requirements, a 7x5 aquarium would not be large enough to house all of these fish together, even if they are not all kept in the same tank. You may be able to keep a couple of these fish together in a 7x5 aquarium, but you would need to carefully research the specific needs of each species and ensure that their tank requirements are met.
