I bought a second hand tank from a lady in Arnhem who got me onto your Dutch equivalent: Kogelvis Forum, she seems to be very active or moderate that. However I was glad to find this forum in my native language!!
Own a Ceylon Puffer (large juvenile) and two GSPs (small juveniles), bought at similar time and housed in a 240 liter full salt tank. They are happily (yes, for the moment!) cohabiting with a yellow Tang, two knight gobies, another unknown and a dragon goby. The latter I plan to re-house into a smaller marine tank as he just hides under two rocks all the time (quite happy there but I think the puffers scare him). Oh - they are in a Juwel 240 with Juwel skimmer, Aquamedic rio 300 power head and the "comes with the tank" filter. I have removed most of the sponge type filters in favor of carbon and other media, change about 25% of the water per month. I have strip tests for nitrate and nitrites, have just got some liquid tests, and have to confess to not measuring much else. I use red sea salt and add some of the Sera "elements" from bottles (they were on sale and I think I'm doing my corals a favor). Overall I probably need to get a little more scientific with this salt water lark
Early on my Ceylon seemed to get two nips to the tail (tell-tale round shape) from one of the GSPs. The Ceylon was quite sickly after purchase from pet shop, got itch, infected the rest of the tank somewhat. A long fresh water bath cured the Ceylon and frequent water changes cured the tank. Now though all three fan their tales and dance around the tank, socially interacting. The smaller GSPs will move fast if they get cornered by the Ceylon, although the Ceylon does not seem to be consciously pursuing them. The GSPs happilly follow the Ceylon and they all do the puffer dance up and down the glass of the aquarium at times.
I'm looking to learn what I need to do to keep a step ahead of any of the puffers becoming crazy and asocial as they get older. Am glad to hear that not all do. I'm also researching a 450 liter tank to ensure that all three have the room needed. The tank is already visually interesting with many live and dead stone nooks, crevices and corridors. So far these puffers have not developed a taste for soft corals (phew!).
Also very curious to hear if any on this forum have had success keeping these with Yellow Tang over extended periods? I know that the Yellow Tang has a sharp bone protruding from the tail fin and will use that quite effectively to cut and warn off any trying to predate. Wondering if this is enough to keep my puffers at bay, or does one just have to live with the fact that the gobies and tang could wind up as puffer snacks some day?
Lastly will be looking for more Ceylon pictures. Mine defo doesn't have F8 markings but his fins are dark red, whereas many of the pictures I have seen seem to show green fins. Of courser I am hoping that by freak chance I have something far more exotic, but will probably find that some Ceylons do and others just don't!
