Im looking at tunze wavemakers to go on my tank which is 19mm glass. I have seen some which are non controllable , don't quote understand what this means do I need to buy a controller for those separately? Im basically looking for the cheapest option that can fit on my glass and allow me to change flow modes still (and to be able to angle the pump which is why I'm looking at tunze to begin with ) what's the best option ? :)
