Good info, PlantedRich! Thanks!
Are there types of wood that don't work in tanks? For example, I have some aged walnut, ash and oak in the basement from previous year trims that DH and I kept for woodworking or craft use. Assuming they're dry enough and I soak/rinse till the color leaching is acceptable, are those woods good for the tank or am I going to end up with a mess in short order?