I am very certain, Gary Greenwood would not take full credit for devising this technique that is very successful for getting particularly difficult species of killifish to reproduce, but it has become widely known throughout the hobby as his system.  Others have made some modifications to The Greenwood Method for their own use and I will note these as I can within the article.

   Thi method primarily uses a permanent style setup where the breeding group of killies is housed for a short period of time and then removed when the first fry are seen.  The fry are then raised in this tank.

The primary material for this technique is Sphagnum Peat Moss (Nosy Be brand if possible).  Filtration should be with sponge filters.  Sponge filters are highly recommended if for no other reason than newly hatched fry will not be trapped.  The sphagnum moss will breakdown in water and it will leave a very fine layer on the bottom of the tank.  It will also lower the pH in the tank.  For these reasons, if nothing else, the tank should siphoned by one-third weekly and the water replaced with whatever conditioned water was used initially.

A heavy layer of sphagnum moss is allowed to float in the tank and becomes the primary spawning media of the breeders.  Don’t be concerned for the adults.  They are very capable of navigating the spawning media.

    It is recommended that feedings be in a specific corner of the tank for easy clanup while doing water changes in case any is left uneaten.  Bill Logue of Massachusetts actually walls off an open area of the tank which divides into a free swimming area and a breeding area.

    Raising the fry is simply a matter of feeding them the proper live foods.  Daphnia is a great choice for this type of set-up.  The daphnia filter the water to feed and will drop napauli small enough for most fry to consume.  The use of infusoria along with newly hatched brine shrimp are by far a nessicity. The use of small worms (vinegar eels, microworms) certainly adds to the feast.

If you are having trouble getting any mop-spawning species, this may well be a viable option.  Diapterons do very well using this breeding method for example.

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