Previous Questions

Can I use more than one treatment or medicine at a time?

For most treatments, the answer is definitely no. You should never use more than one fish medicine at a time, because they might react with one another in the water. 

The exceptions are King British Filter Aid + (formerly Safe Water), King British Safe Home and King British De-Chlorinator (formerly Safe Guard) water treatments. These can be used with any other treatments, including each other.