Describe the observation
Note the female, if identifiable, the date, and whether eggs were visibly attached during the previous check. A missed viewing interval creates uncertainty.
Use phrases such as “fewer eggs visible” instead of claiming the exact number lost when the view was incomplete.
Add tank context
Record water tests, temperature, maintenance, new arrivals, and any handling. These details may help an experienced keeper review the pattern.
Do not change food, minerals, and water all at once in response to a single observation.
Look for repetition
One egg or one unknown cluster may be ordinary variation. Repeated losses across females or accompanied by deaths deserves a broader review.
Keep the female undisturbed and ask for help with the log and test results if the issue continues.
Use these as general hobby references. Test your aquarium and confirm product guidance before making changes.