Pool filter sand problems
about two months ago i decided to start a new planted 40 gallon breeder tank. I was short on money so instead of buying a real aquarium plant substrate, I bought some cheap pool filter sand. At about the two week mark I added some guppies (still living in the tank.Two days ago i decided to finally add some plants after adding some root tabs and some flourish excel i thought they would be fine. When i checked on them today the plants looked fine but the roots were slowly rotting away. I would think this is lack of nutrients right? Anyway I moved the plants to a different tank and they are recovering, but how can i solve this problem? Should I add something to the sand, or should I just get rid of the sand and get some eco complete?