Carbon, if you are broke like me...
If you do use it, buy a pound or 2 at one time, it is even cheaper that way.
Remember, the holes in carbon clogs up really fast. I like to put it in for a week, then swap the carbon out for fresh carbon.
Obviously this will come at some cost to your plants, but nearly negligible in my experience.
Soon the water will be clear enough that your weekly water changes will be enough to stay ahead of further leaching at which point, stop using carbon..
Cape Town, South Africa.
Hi. I'm back.