i have a t-stat on order, will be here wednesday, and i will be picking up a dimmer tomorrow after i see what a straight light does now that i changed bulb (went from blue 50 to red 75) as it stands now the ambient temps i think are looking good, still need another thermo for inside under substrate i think though, or move one of the ones i have reading ambient to hot side under substrate and centralize the other? based on the how to set up a glass tank sticky he only used one or two thermo's and one was buried under the substrate over the UTH.