I would recommend addind the new media but also keeping the old media so you have the new media building up for when you take the old media up.
Different fish react differently to different situations kinda like humans
, my office is probably a good example, 2 people out of 20 caught the flu and the remaining 18 didnt even get a sniffle. Some people are just more tolerant and the same goes for fish.
The liquid
test kit is expensive but worth it and it is a good tool to use when things dont look good in your tank to eliminate water (just check other threads the first thing people always ask for is
ammonia and
nitrite levels when fish are acting funny).
