Thank you, thank you! What I wasn't sure about was whether it was necessary to check the trap in the middle of the night. I basically got:
1. Shrimp in water till stinky
2. Shrimp in trap
3. Trap in tank at lights out
4. Squirt stinky water around trap
5. ??? Remove trap in middle if night to collect cirolanids and replace??
Did you also do nighttime tank raids ir did you wait till the AM to collect what was still in the trap?
I eventually abandoned the shrimp in a trap altogether. The vast majority was:
1. shrimp in water till stinky (throw it in there first thing in the AM and it'll be ready by lights out
2. lights out, turn off flow except for return
3. use a red LED flashlight otherwise turn your LED red channel only (the little buggers are a lot slower to react to red light)
4. use a turkey baster or something and shoot stinky water at front of glass.
5. when you see them, they'll be little white things swimming around or on the glass.
6. suck one up with a turkey baster and shoot into a jar, suck up another, shoot into jar, etc and so on (if you have a small tank dont forget to replace some salt water!)
7. if they are free swimming, a very fine net works to catch those.
I'd do that for maybe 15 minutes every few nights. If you are only seeing 1 or 2, you don't have many in there at all. I would see twice as many as I'd catch usually.
I think your tank is too small for a Dusky Wrasse, but I gotta say watching one of those things hunt all day long, I think he's helping by finding them in the sand where they hide. In my experience most of these isopods hide in the sand not in the rock.
