Measurement
0.5 or 0,5? Keep decimal notation clear in aquarium records
Practical examples for copying decimal quantities between labels, spreadsheets and messages.
By FishyMag · Published
FishyMag editorial workflow · Not a clinical review or treatment recommendation.
Quick answer
Copy the original quantity and unit first. If you change decimal notation, label the reformatted value clearly and check that the number has not changed by a factor of ten or a thousand.
Keep the original beside the reformatted value
A note such as “original label: 0,5 mL; reformatted: 0.5 mL” makes your interpretation explicit. Do not remove punctuation and leave “05 mL”. If you cannot establish the convention used by a source, preserve the ambiguity instead of silently picking one. The same care applies when a comma could separate thousands rather than decimals.
Check a pasted number before using it
Some software treats an unfamiliar decimal format as text, a list separator or a different number. After pasting, compare the displayed quantity with the source. Keep the unit in its own clearly labelled field when using a spreadsheet. A successful paste is not proof that the software interpreted the input as intended. Do not test a new format by acting on the result in a tank.
Use a short verification line in a handover
Write the complete amount in a plain format and retain a photograph or source reference when the number matters. For a shared record, agree which notation everyone will use. If another keeper copied a value, have them check against the source rather than reconstructing what the punctuation probably meant. This is a recordkeeping check, not a dosing conversion.
Put it into practice
Your checklist
- Save the original number and unit.
- Verify how the destination software interpreted punctuation.
- Explain any notation change in shared records.
Sources and scope
This article distinguishes manufacturer statements from FishyMag’s own workflows and arithmetic examples. Linked formulation records retain their own evidence dates; publishing this article does not refresh those records.
AI-assisted writing and development. Not hands-on product testing or veterinary review. How we publish →
FishyMag reports what manufacturers say, quoted and linked. It does not diagnose illness or recommend a treatment, and it never infers that a product is safe from the absence of a warning — where no statement exists, it says so.
Formulations change. Always read the label on the bottle in your hand, and contact the manufacturer if your tank contains anything valuable or unusual.