Sorry to hear about your troubles alex.
I am sure that others might disagree with me on this, but I have often read/heard that the only good reason for using medicine in order to prevent an illness/disease would be to prevent a bacterial infection on an injured fish. Hence, if I found myself in your shoes, I might seriously consider moving your
porcupine puffer into a hospital/q-tank and using a mild dose of antibiotics. IMHO, the important part of that advice being the 'mild', meaning less than the instructions suggest, possibly in the range of a half dose or so. Additionally, be sure that you use a q-tank for this purpose rather than taking the risk of losing your beneficial bacteria due to antibiotic use.
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I know that friends of mine have lobsters in their tanks with no problems, one of which is rather large and doesn't bother my friend's Yellow Tang.
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To be honest, I have never kept or even thought about keeping a lobster in my own tanks, so I don't know much about them at all. However, I would not be surprised to find out that one hobbyist has a lobster with an immense attitude problem while another hobbyist has an insanely docile version of the same lobster. In fact, that would also apply to any livestock we might keep.
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Will the lobster attack him again or will he learn to stay away from it?
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I think the problem you are going to find is that your puffer is apt to spend quite a bit of its time 'resting' on the substrate or live rock, especially during the day and/or after eating...at least this is exactly what I found when I kept the exact same type of puffer at one time. That said, this fish may make an easy target for your lobster. Personally, I might also begin to think about removing either the puffer or lobster, depending on what you want to keep the most. Again, I am sure that some people may have been able to keep both in the same tank without an issue, but in my mind, the potential for one or the other getting injured badly or dieing is too great for my tastes.
In any case, I can tell you that I really enjoyed having the same puffer in my own tank...although the reason I don't have it now is because it found a good snack in every fish I tried to add. In fact, I have often heard that they are considered to be the saltwater version of 'man's best friend' due to their having a lot of personality and seem to recognize one person from another. Just to be sure, I would also point out that allowing this puffer, or any other for that matter, to actually puff up is always discouraged since this is stressful and I believe puffers, or at least the type you have, are very prone to Ich and a few other issues you would probably like to avoid. This is also not to mention that, should your puffer inflate itself with air rather than water, it would have a hard time deflating itself, becoming stressed or injured. With all of that in mind, another concern might be the lobster causing the puffer to puff up too often, if it winds up being unable to get a grip on it.
Obviously, I would strongly urge you to take at least some action to prevent either one of your aquatic friends from swimming into an early grave; as I am sure you will.
