I tried one Oto, but they kicked the bucket after one night. How's that Red Sea Flora Base working out? Does it keep your pH at 6.5 to 7.0 without having to dose CO2? Does it still get cloudy when you mess with the substrate. I have Eco-Complete, and are wanting to setup different tanks with different kind of gravel for a change of scenery. I haven't tried anything other then Eco-Complete due to fear of other substrate clouding up the tank.