First there was a Crocodile Gar. Then it was a Banded Knifefish, presumably to go into that massive & overstocked 55g. Not big enough yet so you wanted a Giant Arapaima Gigas. Apparently, unsatisfied with your current options, you asked about Sturgions (a new version of the common Sturgeon) for "240 gallons and 5000 gallons?". Then we get into Shark Ponds, scientific research for artificial fertilization & hybridization, a stergeun (yet another version), a 6000g tank to contain these hybrids, the sudden appearance of a Saber Toothed Tetra, and finally 5 400g tanks.
I need a nap