yes they do get injured.
jus put them back n let them recover.
they r afew factors.i think the prob is not the fall but ur tank. its only 3 weeks old. corals need at least 3mths be4 they can be put in the tank. ur tank is very very young.i dun think the coral cant make it........
2nd, ur lighting may not be enuff...therefore bleaches..or when it fell it didnt receive light
3rd is ur water....hows ur ammonia,no2,no3
n 4th...ur temp...this is the way most corals die when the temp is too high.it takes abt 2-3weeks be4 is succumbs to the temp. ur temp shld b below 29
corals tend to spew out mucus looking stuff when they are stressed. Keep it cleaned around polyp heads but don't scrub it. It will hopefully recover. It may be a little bleached for a while
btw wat coral izzit? we need more info to help.
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