PERSONAL EXPERIENCE ONLY
Grimreaper, (I know, it's not reaper)
I have a 29 gallon skimmerless reef set up. Plenty of LR, DSB of aragonite, powerhead, very light fish load, (small true perc, 6 line wrasse) and coral everywhere...(Open brain, schromms, seamat, leather, frogspawn etc) Coraline...