Hi, I have a 64 litre tank fully cycled and running since 2017. It currently houses 4 male guppies and 3 peppered corys. The substrate in the tank is currently gravel, however I have learnt that sand is much more suitable for corys and I have done research on how to go about changing the substrate. My questions is when cleaning the sand before putting it into the tank, can it be cleaned with normal tap water or does the water need to be treated before cleaning the sand.
Thank you in advance
Thank you in advance