The way I look at it, one of two things is happening:
1) You got the Isopod on your LR
8 months ago. Since you have had fish, the Isopod has been sucking the blood out of your fish at night when no lights are on. Isopods rarely cause visible damage to fish when they do this.
2) You got it three weeks ago with the frag
. I am not sure of the life cycle of an Isopod, but the one you have could be ready to drop a batch of eggs in your tank, then you are really in trouble.
Either way sucks. IMO
you gotta get that out of there.
I caught two in my tank with a turkey baster and a lot of patience. You can catch them wandering around the substrate at night. A dimmed flashlight helps to find them, since they run from light. Also, if you have a red lens for your flashlight, use that. Here are the ones I caught:
2x Sunburst Platys (2M, 2F) // 3x Neon Tetras (?) // 2x Cherry Barbs (1M, 1F) // 2x YoYo Loaches (?) // 1x Bushy Nose Pleco (M) // 1x Clown Pleco (?) //
-30# Live Rock
-Mixed Snails (Nassarius // Cerith // Astrea // Black Turbo // Mexican Turbo)
-8x Blue Leg Hermit Crabs // 1x Banded Serpent Star // 1x Cleaner Shrimp
-1x Royal Gramma // 1x Percula Clownfish
-2x Mushroom Leather // Metallic Green Star Polyps // Pulsing Xenia // Striped Xenia // Blue Mushroom
-Remora + Maxi-Jet 1200 // 2x Maxi-Jet 600 // Maxi-Jet 400 // Visi-Therm Deluxe 50 // Current USA Orbit 2x 40w PC