My Betta is currently in a 5 gallon tank. I bought a Fluval Edge 6 gallon for his new home. His tank has obviously cycled, but unfortunately the Fluval Edge has a different built in filter than the one that's in my current tank. Therefore, I don't think I can transfer the cartridge into the new filter for bacteria purposes. I'm also going with a different substrate in the new tank rather than gravel.
I was thinking of just using maybe half of his old tank water to fill up the new one and substitute the rest of the water with fresh dechlorinated water. However, I'm not sure if this is enough for the bacteria to transfer over. What do you think?