Probably stressed. What are it’s tankmates?
Yes to the lights off. Would hold off on the lights. Got plenty of hiding spots?
3 - other Syno’s / 2, 1” , and 1, 4”
4 - bristle nose 1”-3”
22 - 1” Victorians ... (2 species)
salt / lights off?
What type syno? Do you have any idea of tank hardness?
You mention it used to have wood which would make me think it was ph less than 7 and possibly softer water. Now looks like ph greater than 7 and potentially hard water?
Did you recently change the decor/setup?


My 3” Syno seems to be swimming laps, taking a breath from the top every lap.