There is a couple schools of thought with puffers and triggers. There is alot of people on this board that say no never, and there are some that have made it work, I say it is a crap shoot. I and one that is takeing the crap shoot, I have a porky and dogface and a huma humu all in my 125. I started them all off at the same time and very small, let them grow up together. It has worked out well for the first year, and I know when the get older is when I got to worry. I had tried to seperate the two puffers before for about 2 weeks and both just laid around and did nothing, so I put them back together and they have been happy ever since. All 3 fish swim around the tank together, and the only time it gets crazy is at feeding time. I do not say to put the two of them together, you just have to be prepared to seperate them if things go south, I have been in this hobby for a long time, and I like to try different thing, this is one of them. Good Luck