Nuff said. It can be a problem.
1. find out where they sleep and net them in the dark.
2. a liter wine carafe makes an excellent fish trap if the fish is eating well. Set it slightly tilted with its lip on the rockwork, and hope the fish will go in after the treat. Have your net ready. Fish don't navigate 'out' well because of the narrow neck.
Let me add, however, the thin glass display dome from our Anniversary Clock is nearly invisible under water and is one of the best fish-catching devices for somewhat larger fishes I have ever found.
3. feed in the net---closer and closer to the glass.
4. last-ditch: de-water your tank fast. TURN OFF YOUR AUTOTOPOFF AND PUMP. Dig a fist-sized depression in your sand in one corner, and pump the water out of the tank very rapidly into a garbage can liner'ed container, or a Rubbermaid Brute trashcan [wipe a new one down with white vinegar]. Fish will gather in the low spot. Take your pick. Caution: also keep a head count going, because a few species that burrow may stay too long in the rockwork---be sure you know where all your fish are. This procedure will not hurt corals, or inverts, or even sponges, which are ok so long as they stay wet, even if they are in air. Just don't let this go on long enough for them to dry. Nab your fish and dump him into the hospital, and immediately devote yourself to pumping water back into the tank---helping it along with a pitcher is not a bad notion. Turn ON your pump and autotopoff.
1. find out where they sleep and net them in the dark.
2. a liter wine carafe makes an excellent fish trap if the fish is eating well. Set it slightly tilted with its lip on the rockwork, and hope the fish will go in after the treat. Have your net ready. Fish don't navigate 'out' well because of the narrow neck.
Let me add, however, the thin glass display dome from our Anniversary Clock is nearly invisible under water and is one of the best fish-catching devices for somewhat larger fishes I have ever found.
3. feed in the net---closer and closer to the glass.
4. last-ditch: de-water your tank fast. TURN OFF YOUR AUTOTOPOFF AND PUMP. Dig a fist-sized depression in your sand in one corner, and pump the water out of the tank very rapidly into a garbage can liner'ed container, or a Rubbermaid Brute trashcan [wipe a new one down with white vinegar]. Fish will gather in the low spot. Take your pick. Caution: also keep a head count going, because a few species that burrow may stay too long in the rockwork---be sure you know where all your fish are. This procedure will not hurt corals, or inverts, or even sponges, which are ok so long as they stay wet, even if they are in air. Just don't let this go on long enough for them to dry. Nab your fish and dump him into the hospital, and immediately devote yourself to pumping water back into the tank---helping it along with a pitcher is not a bad notion. Turn ON your pump and autotopoff.
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