I have a 25l tank with 4 guppies which has been set up for about 6 months now.
It had fully cycled within the first 2-3 months of us having it but now the ammonia levels seem to be creeping up again. Today we had readings of 1ppm ammonia, 0 nitrites and 1ppm nitrate so the cycle is happening.
We recently changed a filter pad as we thought this might have been the problem as it says to change it every 4 weeks but we have not seen any improvement.
We are currently doing 40%. Water changes every second day to try and keep it down.
I can see a layer of gunk beginning to build up under the gravel. Should we completely empty the tank to sort this or just try and get in with the syphon.
It had fully cycled within the first 2-3 months of us having it but now the ammonia levels seem to be creeping up again. Today we had readings of 1ppm ammonia, 0 nitrites and 1ppm nitrate so the cycle is happening.
We recently changed a filter pad as we thought this might have been the problem as it says to change it every 4 weeks but we have not seen any improvement.
We are currently doing 40%. Water changes every second day to try and keep it down.
I can see a layer of gunk beginning to build up under the gravel. Should we completely empty the tank to sort this or just try and get in with the syphon.