Trouble is, selling mature media isnt a guaranteed way of creating a mature tank and if a shop implicated that it does or even 'should' and something goes wrong... the shop will be liable...
Also, its not a great idea to be selling media off a system that is exposed to so many fish from so many different suppliers and treated regularly with different treatments...
You run the potential risks if say... if a treatment like Malachite is used regularly (which it is and is base ingredient in medications like protozin and myxazin etc) but it is also a form of copper,.... what if the customer planned/already had shrimps and it ended up killing them all?
What if someones fish got sick? Could be a complete coincidence but do you think they will care? Doubtfull... it will still come down on the shop every time something goes wrong and in retail... you have to consider every eventuality of what might go wrong when weighing up the pros and cons because you can guarantee it will happen.
It also relies on shops giving up selling space for media to be put on the system as it cant be put in most of the filters as generally the systems are run on enclosed bubblebead or sandbed (swimming pool) filters or aerobic/anaerobic filter beds that can't have sponges etc put in them but the media cant keep being removed and isnt suitable for going in internal or external filters as it floats and is small enough to screw up filters (can you see that coming down as being shops fault as well and having to pay out to replace a filter?!)
Also, its not a great idea to be selling media off a system that is exposed to so many fish from so many different suppliers and treated regularly with different treatments...
You run the potential risks if say... if a treatment like Malachite is used regularly (which it is and is base ingredient in medications like protozin and myxazin etc) but it is also a form of copper,.... what if the customer planned/already had shrimps and it ended up killing them all?
What if someones fish got sick? Could be a complete coincidence but do you think they will care? Doubtfull... it will still come down on the shop every time something goes wrong and in retail... you have to consider every eventuality of what might go wrong when weighing up the pros and cons because you can guarantee it will happen.
It also relies on shops giving up selling space for media to be put on the system as it cant be put in most of the filters as generally the systems are run on enclosed bubblebead or sandbed (swimming pool) filters or aerobic/anaerobic filter beds that can't have sponges etc put in them but the media cant keep being removed and isnt suitable for going in internal or external filters as it floats and is small enough to screw up filters (can you see that coming down as being shops fault as well and having to pay out to replace a filter?!)