ask your friend if you can get some of his cycled media to add to your filter. This tank is not cycled completely and is having bacterial blooms. Flocculents won't really help and you are wasting yoru money. Do you have a good liquid test kit?
For sure it's cycling, post a pic of the tank and the fish and I bet the fish will be pale and stressed. As someone mentioned get some established gravel or anything from your friend to add to your tank.
For sure it's cycling, post a pic of the tank and the fish and I bet the fish will be pale and stressed. As someone mentioned get some established gravel or anything from your friend to add to your tank.