In general, the mods are pretty nice to us and let us govern our own forum in regards to off-topic posts. Meaning, in general, they allow threads of that nature to exist in our forum as long as people aren't complaining (whereas you could not get away with posting something like that in the main selling/trading forum).
I personally see nothing wrong with it given that you are looking for specific reef equipment and you aren't really intending to profit off of it (i.e., you aren't using the forum as another craigslist).
But, in the end, I don't have the say...