The problem with jardini is they get to the size of yours and they want to kill every tank mate
Jars are the most aggressive of all aros
I think you paid well over the top for yours when it was small
The going price for a small jar is $90
Larger jars are about $150 as people like to get them small and grow them
I think $300 is more than double what it's worth
Sorry but jars are not a fish that go up in price with size because of the aggression