Any type of porus material in a stocked aquarium that has adequate circulation will become 'live' because it will soon host ammo/nitrite reducing bacteria.
is called such because it hosts more than just the generic utility bacteria that take care of ammonia and nitrite. Healthy LR
contains other organisms and bacteria that help break down nitrate and other nutrients that contribute to algae growth. Nuisance algae usually has a hard time growing on healthy LR
because all the 'good bugs' inside LR
(or growing on the surface such as corallaine alage) suck up the nutrients on the surface and don't leave anything for nuisance algae to eat. Hence, why we assume LR
that's not so 'live' as growing lots of algae.
Lot's of alage in a tank is a sign of many, many symptoms. Bad water, too much white light, low PH
, high nitrate counts, etc.