What type of filter? Also, you will need to upgrade your tank ASAP. A 30 gallon is barely suitable for 1 RBP
You will need a liquid test kit, I use the API Master kit... an affordable option at around $20.
Never change all of the filter media. Gently rinse them out in a bucket of tank water (tap water will kill the bacteria) during a water change, a good shake should do the job. Maybe 2 or 3 times per year when you replace the media place the new one in beside the old one for a few days. Never replace more than 50% of the media at a time.
You will need a liquid test kit, I use the API Master kit... an affordable option at around $20.
Never change all of the filter media. Gently rinse them out in a bucket of tank water (tap water will kill the bacteria) during a water change, a good shake should do the job. Maybe 2 or 3 times per year when you replace the media place the new one in beside the old one for a few days. Never replace more than 50% of the media at a time.
