been using my CRs and Jap mat for many years , every 3 - 4 months just wash it with tank water and good to last me until the next time i see it all clogged up..
for changing my biohome or those bacteria house sticks , i just change when it becomes powdery.
for my jap mat & CR so far never changed , dont think it will spoil , but i guess i will change when i see for random reasons ammonia starts to be present with my constant routine and without changing my bioload.. so then i probably take a guess that the media starting to age.. slowly change 1 compartment every 1 - 2 weeks and of course add BB
no harm changing anyways as long change right way and fishes are ok
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