Hi everyone just joined this forum ,just set up a new 100L aqua oak tank brought from maidenhead aquatics really nice piece of furniture after four long weeks of cycling finally got fish in and up to max ammonia and nitrites holding at zero and nitrates at 20 on api test kit , filter media replaced with biohome miedia seems to be very good media ,thought i would join forum just in case i need some advice although i have been keeping fish for years now including koi and tropicals . Thanks.