Thanks. I read through algae post and don't know what could be causing the excess nutrients, unless it's a byproduct of fishless cycling. I've been using tapwater for changes, so that could also be the problem. Looking into a cheap DI
unit to start. Also saw the reference to kalkwasser, but I'm not sure what that is (quick search on this board didn't turn up much). Is it meds/chemicals. Not sure I want to medicate the tank now, if just introducing fish....
Will most likely go with some snails, though.