Aquarium log for freshwater and saltwater tanks, 22 undated pages

Aquarium log pages bring every water test, water change, maintenance job, feeding and livestock note together, whether you keep a freshwater or saltwater setup. Across 22 undated pages you will find a profile of your tank, cycling notes, a monthly water tracker, an equipment inventory and a guide for your tank sitter, in US Letter and A4 PDF.

It is an instant download. Nothing ships to you, so you can print and start logging today.

How an aquarium log keeps your tank stable

Record your temperature, pH and nitrogen readings every time you test, then look over the whole month on the 31 day grid. A slowly climbing nitrate or a sudden pH shift becomes obvious long before your fish react. Upkeep is divided into daily and weekly jobs, jobs for every 2 to 4 weeks and jobs every few months, and a monthly checklist lets you mark them off week by week.

Cards for every fish, invert, plant and coral, along with a livestock list and an equipment list that includes model numbers, tell you exactly what lives in the tank and which replacement parts to order. When something looks off, the health notes, quarantine log and treatment log give you a clear history to share with your fish store or an aquatic vet. Because nothing is dated, you just print more logs as they fill.

Who this fish tank log is for

• Keepers of freshwater, saltwater, reef, planted and brackish tanks who want every record together
• Beginners setting up and cycling a first tank and waiting for ammonia and nitrite to hit zero
• Hobbyists with more than one tank who print a separate set for each
• Families with a pet fish, and anyone handing the tank to a sitter while away
• Anyone who would rather keep a paper log by the tank than use an app

Design and printing

• Elegant, minimal style: white pages with soft blush pink details that are easy on ink
• Wide margins throughout, so a home printer will not crop the edges
• US Letter (8.5 x 11 in) and A4 (210 x 297 mm), portrait
• Undated, so begin any day and reprint the logs once they are full
• Fits a binder or clipboard, or have it spiral bound at a print shop

Inside the aquarium log: 22 pages

1. 1Cover with an index and lines for your name and the tank's name
2. 2How to use this log: 3 simple steps, a quick look at the nitrogen cycle (ammonia, nitrite, nitrate), the test kit and tools you use, a snapshot of your tank and when you plan to log
3. 3Tank profile: the basics, checkboxes for tank type (freshwater, saltwater, brackish, reef, planted and more), key equipment, water source, a table of target parameters and goals for the tank
4. 4Aquascape layout: a dot grid area for sketching, hardscape and decor, plants or corals and their positions, notes on light and flow and ideas for a future rescape
5. 5Fish and invert profiles: 4 cards covering species, nickname, date added, where it came from, adult size, temperament, diet, preferred zone and notes
6. 6Livestock inventory in 18 rows: when each animal arrived, its species, how many, where from, what it cost and how it is doing, plus losses and lessons and a current headcount
7. 7Plant and coral profiles: 6 cards for name, date added, light needs, position, feeding or dosing and growth notes
8. 8Cycling notes: details of when the cycle began, 6 milestones with dates and a 16 day table of ammonia, nitrite, nitrate and pH readings
9. 9Water test log with 21 lines, each for the date, temp, pH, the three nitrogen readings, KH, GH or salinity, and a note
10. 10Monthly water tracker: a 31 day grid with 7 readings and one spare row, plus 6 daily care tasks and a spare row to check off
11. 11Water change log: 19 rows noting volume, conditioner or salt, matched temperature, gravel vacuum and nitrate before and after, plus your usual routine
12. 12Maintenance schedule: checklists for daily, weekly, every 2 to 4 weeks and every few months, your own tasks and reminders
13. 13Monthly maintenance checklist: 14 tasks across 5 weeks, problems you noticed and a to do list for the coming month
14. 14Feeding schedule: 7 days of morning, evening and treat feeds, a table of foods with opened and use by dates, notes, a vacation feeding plan and signs of overfeeding
15. 15Cleaning log: 18 rows for what got cleaned and which media you rinsed or swapped, plus filter media dates and cleaning supplies
16. 16Equipment inventory: tank, stand, filter, heater, lighting and more with brand, model, cost and warranty, plus spare part sizes and possible upgrades
17. 17Health notes listing 12 warning signs, an observation table of 12 rows (which animal, what you saw, the water reading, your action, the result), questions to ask a store or vet, and contacts
18. 18Quarantine and treatment: separate quarantine and treatment logs of 7 rows each, plus quarantine tank setup and notes
19. 19Purchase log: 22 rows for date, item, store, quantity and cost, with a page total, favorite stores and items running low
20. 20Stocking plan and wishlist, starting with 8 rows to check compatibility, then fish or inverts on your dream list, plants or corals to try, planned upgrades and how many the tank can hold
21. 21Tank sitter guide for a friend, with the days you are away, who to call, how to feed, a list of dos and don'ts and steps to follow if anything seems off
22. 22Monthly tank review: highlights, tricky moments, ratings for water stability and tank health, livestock changes, spending and next month's plans

What you download

• Aquarium Log, US Letter PDF (22 pages)
• Aquarium Log, A4 PDF (22 pages)
• Read Me First, a short printing guide (PDF)

How to download and print

• Check out with PayPal, a debit or credit card, Apple Pay or Google Pay. Your download page opens as soon as the payment goes through.
• We email the same private download links to you, so you can download your files again later.
• Open the PDF in a free reader such as Adobe Acrobat Reader and print at 100% or Actual size.
• Print only the pages you need, as often as you like, for your own personal use.

Good to know

• This is a PDF for printing, not a hyperlinked digital planner. You can still import it into most note taking apps and write on the pages.
• It is a digital file only. Nothing physical will be shipped.
• Colors can appear slightly different on screen and on paper.
• For personal use only. Sharing, reselling or redistributing the files is not allowed.
• Digital files cannot be returned. If a file does not open or print correctly, email us and we will help right away.
• The log is an organizing tool, not veterinary advice. Confirm each species' care needs with a trusted aquarium source, and ask an aquatic veterinarian about sick fish or medication.

How this was made

Designed and written by PetiteDiary. AI tools helped draft parts of the text, and some background scenes in the preview images were created with AI. Every page was designed, reviewed and checked before release.

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