A couple questions. So I'm thinking of changing the internal filter in my five gallon tank (Tetra Whisper) to a HOB filter of the same brand that uses the same cartridges, so I can keep using the same filter. I'm pretty sure the the internal filter's motor is increasing the temp of the tank a little, and it takes up a lot of space and I want to give my betta, Circe, more room to swim. If I'm using the same cartridge, will changing the filter itself disrupt the cycle too much? Also, what are some good ways to reduce the suction on the filters so my bettas don't get stuck? My other tank of most concern has a HOB filter and the betta in that tank likes to sleep in the corner where the filter is.