Rainy Season Simulation
Many tropical species spawn during the rainy season when rivers soften and cool. Drop water temperature by 3 to 5°C over 2 days using ice packs or a chiller.
Simultaneously lower TDS by replacing 50% of tank water with pure reverse osmosis water.
Hold the new condition for 3 to 7 days. If no spawn occurs, slowly return to baseline and retry after 2 weeks.
Temperature Drop Protocol
South American cichlids spawn on temperature drops of 2 to 4°C. African rift-lake species spawn on rises of 2°C.
Use a thermostat controller to prevent overshoot.
Food Quality Boost
Two weeks of live food (blackworms, bloodworms, BBS) before any trigger attempt increases female egg production 2 to 3x.
Feed 4 small meals daily during this conditioning window.
Photoperiod Control
Extend lighting from 10 hours to 14 hours to simulate a longer summer day.
Combine with gentle surface agitation from a sprayer bar to simulate rainfall on the water surface.