lights go out snails come alive..why??

Every night when my lights go out every snail possible even ones under sand come out on my glass and they are always in a group. Never spread out.

 

Some are very nocturnal. You stand a better chance in the wild if your slow moving and taste good if you come out when the fish are asleep.

They are probably grazing where the most algae or film algae growth is.

 

Mine do the same...I have 15 shrimp that wont come out when the lights are on..but when the lights go off..I swear its like roaches scattering about...it takes a while but the snails follow...their nocturnal...and CORILLINE hit it on the nose...if your small and tasty its best if you wait till the coast is clear before stepping into the wild.

90 GALLON DISPLAY
IN DISPLAY TANK;

180 LBS FIJI PREMIUM LIVE ROCK
95 LBS LIVE SAND
(2) 50 GPH POWERHEADS(CARBON STUFFED)
(2) 1300 GPH POWER HEADS

LIGHTING IN DISPLAY;
T5 NOVAS 48 INCH(6 BULB FIXTURES)
48 INCH MARINLAND L.E.D REEF LIGHTING(18K)
48 INCH (24) BLUE LED MOONLIGHT

30 GALLON SUMP
IN SUMP;
40 LBS LIVE SAND
15 LBS FIJI PREMIUM LIVE ROCK.
35 LBS REFUGIUM RUBBLE
PHOSBAN REACTOR(150)
10 WATT U.V STEROLIZER (DONT HAVE AN ICK PROB)BUT BETTER SAFE THEN SORRY
CORALIFE SUPER SKIMMER(120)
(ELITE) 200 WATT HEATER
(10)MANGROVES

LIGHTING ;
IN SUMP
30-90 WATT FLOOD LAMP

FISH
SAILFIN TANG,YELLOW TANG,BLUE HIPPO TANG,DIAMOND WATCHMAN GOBY,SIZZORTAIL GOBY,BLUE DAMSEL(6) BLUE GREEN CHROMIS(4)ENGINEER GOBY

CORALS AND INVERTS
BLUE RICORDEA,SEBAE ANENOME,DUNCAN POLYPS,BROWN BUTTON POLYPS,RED AND PURPLE MUSHROOMS COLONY(6) SKUNK SHRIMP (3) CAMEL SHRIMP(6)PEPPERMINT SHRIMP(8)MEXICAN TURBO SNAILS,(6)CERITH SNAILS,(4)ZEBRA SNAILS(5)RED LEGGED HERMIT CRABS,(5) BLUE LEGGED HERMIT CRABS,

IN SUMP;
(2)GREEN EMERALD CRABS
(5) BLUE LEGGED HERMIT CRABS
(5) RED LEGGED HEMIT CRABS



TO tHoSe WhO rOcK...WiTh A fiLTeR sOcK.....
>>>>>>> I SOLUTE YOU <<<<<<<<

 

HA! I had the exact same experience when I first added my CUC. Reefcleaners shipped me like 3 times the amount of dwarf ceriths I had actually purchased and when the lights went off, it looked like the great snail migration climbing up the walls of my tank.


Its nothing to worry about and Corailline and NITTINID are right about trying to avoid predators

 

Same with me....