Doing a search for Seahorses in this thread came up with none. I have a 29G nano with 2 H. Erectus for 8 months now. Since the first week after cycle there has been a cyano problem. There is plenty of flow, along with a protein skimmer in a 5G sump. A couple of crabs and snails along with a cleaner shrimp for a CUC. Food is controlled in feeding stations with very little waste. 5G weekly WC with vacuuming gravel. Ph- 8.0, SG-1.026, phosphates and nitrates are undetectable, 72F. I have been running a 12 hour photo period with 10 hour moon lights. I just started a lights out period 3 days ago and now found this thread. I also was considering pulling everything from the tank and starting new. I think I will start dosing 1ml per 10G every 12 hours. Before I start, does anyone know if H2O2 and Seahorses are compatible? BTW, I have 2 reef tanks and a FOWLR with no algae or cyano problems.