I like 2 filters on most tanks 20g+. Then you can clean the heck out of 1 without damaging you beneficial bacteria much if at all. The BB should double in 24 hours. You alternate filter cleaning every 2-3 weeks. So even if you damage even 50% of bb in 1 filter there's more than enough in the other filter & on a tank surfaces (substrate, decor, glass, it's every where!)
Unless you tank is very overstocked, there will be no issues. I've done this for 30+ years
Unless you tank is very overstocked, there will be no issues. I've done this for 30+ years