Well through the research I have done tank size is very debatable. Most info I read is that the tank will be fine as long as i stay up with the water changes.most sites say 75 is fine for the lionfish and for the puffer is a little small because of the messy eating if the tank isn't maintained well. It's going to be a one fish tank so i don't see an issue.
Feed your Filtration
Give it to Porc Chop he'll eat anything!!!!!
"This is my tank and these other fish just live in it"
^ Quoted from Porc Chop^