alligator gars

Hi.. I have had George my gar for 10 plus years - he would very randomly bank into tank and I mean very rarely however the last few weeks it has seemed to become a regular thing he speeds up and crashes even has a little white on his nose - I also know they tend to jump he never did attempt to...

Thinking of purchasing a gar, seller said that they are Australian spotted gar, but to me they look like alligator gar ? Please help. Attached are the sellers photos