Hi bro as you mentioned it just happened overnight, it may have been cos of a swing in ur parameters. You should check if any of ur things malfunctioned (e.g. auto feeder, refugium light, thermometer, dosing pumps, etc.) My fan broke for my nano 10g last time, and it ended up crashing cos of that. If it's any of these, restoration of ur params should be good enough for them to get over any stress they experienced. Good luck, should be able to recover. [emoji108] Sent from Singapore Reef Club mobile app