I'm wanting to set up a 5 gal. With heater. Wasn't planning on using a filter but after reading some posts today about heaters there was mention of water movement to help distribute the heat evenly. The reason I don't want to use a filter is because I travel a lot and won't be able to monitor the process. ( wife will do water changes but don't think she will even want to try and understand the cycling process) But would the filter naturally cause a cycle to start? Any other way to keep the tank every heated?