Article Seeding a Tank/Filter

by Dr. Adrian Lawler

A tank should be "seeded" (inoculated with waste-oxidizing bacteria) when:
l. A remodeled tank is stocked-out.
2. An ammonia build-up occurs when:
- A tank is over-fed, or animals throw up their food.
- Air is left off a tank for too long a time and the biological filter bacteria die off.
- A tank's filter is cleaned too well, discarding too many bacteria.
- An organism gets killed or dies (does not survive shedding, injury, or other causes of death) in a tank.
- Too much city water (high in chlorine and ammonia) is added to a tank killing biological filter.
- A treatment used in tank kills off biological filter.

Excess ammonia should be decreased by water change or addition of AmQuel prior to re- seeding a tank.

Bacteria for seeding a tank can be obtained by:
- Getting a commercial product (Fritz-zyme, other commercial products).
- Backflushing a sand filter.
- Squeezing out sponge filters.
- Siphoning from an undergravel filter.
- Adding coral or gravel from an established filter.
- Adding filter floss from an established filter.

Bacteria should be obtained from a tank with a similar salinity to the tank being seeded. Seed should not be gotten from a tank having recent problems with ammonia, algae, or disease.

If sufficient bacteria are added, a new tank (or re-seeded tank) can be set-up without a three to four week "cycling" process.

Experience plays a great part in ascertaining the amount of debris, etc. needed to seed a tank - a 210 gallon tank needs two to three one-gallon scoops of coral (gravel) from an operating tank in order to properly inoculate it. Spread coral (gravel) evenly over tank bottom.

As the bacteria for a biological filter need food (= waste products) in order to survive and grow do not inoculate a tank and wait one or more days prior to adding organisms.