Yes, the tank is really small for all this fish, valentini puffer likes to swim in the stream, and lion will grow to may be 5" in a months
At the bright side, my valentini puffer (more 1.5 yrs old) lives in peace with lionfish (and in the past with 2 more lionfish and tassled filefish).
Details with illustrations are here:
http://dhost.info/defineyourreef/refpages/pufferv.html