Bumblebee gobies
are safe with figure-8 puffers,
Tetraodon biocellatus, a much smaller, low-end brackish fish. As you have seen, the Ceylon puffer,
Tetraodon fluviatilis, will simply view them as food if nothing else is on offer. It's probable that your retailer, or whoever recommended the gobies, got the two species confused. It's not that hard to do if you're not familiar with the species involved.
Ceylon puffers are generally not considered reliable community fish. This varies. Some people have specimens that get along perfectly well with other fish, but a significant number of specimens seem to be at least fairly aggressive. Often they can be kept with their own kind, and sometimes with fast moving fish such as monos and scats as well. But there are consistent reports of nasty specimens that have to be kept alone.
Cheers,
Neale
I put a ceylon puffer in with a severum and couple of rainbows with view to putting him in a brackish tank that was cycling. After 2 days he started to nip the others BADLY and had to be put in a holdng net until the tank was ready. When he was in his brackish tank, i bought 6 bumblebee gobis as i had been told they would be ok with him.He ate them in about 3 minutes!!!!!
Depends on the puffer, and depends on the plec. The dwarf species,
Carinotetraodon spp., are generally considered by aquarists who have kept them (including myself) to be safe with
Otocinclus spp., which are, after all, merely miniature plecs. My South American puffers,
Colomesus asellus, totally ignore a 15 cm
Panaque catfish in with them. It is quite likely the figure-8s and Ceylon puffers might nip at a plec, just as you describe, but neither should be kept with a freshwater catfish since they both need brackish water.
Plecos (the most probable candidate for the cleanerfish you mentioned), are one of the few fishes that pufferfish wont nip. And even then, its only if you get lucky. I've personally seen a tank full of pufferfish nip a pleco to death and were nibbling at it at the LFS (local fish store).
The whole "puffers in with community fish" is a complex issue, made so by the fact that there are a good couple of dozen species of freshwater and brackish water pufferfish traded more or less frequently. That's why it's important to identify which species are available in your neighbourhood, and then do the research. The Oddballs forum here is perhaps the best place to ask specific questions; there are quite a few people there with substantial experience of the various pufferfish species. I have never kept either Ceylon puffers or figure-8s, so can't quote from experience.
Cheers,
Neale