Most fish deaths are preventable — if you catch the warning signs early. The free Aquarium Survival Checklist walks you through 25 things to check, in order, before your fish die. Print it, stick it near your tank, and never get caught out.
- The 7 water parameters that quietly kill fish — and the safe range for each.
- A simple daily, weekly, and monthly routine.
- Emergency triage steps for the moment a fish looks sick.
- The beginner mistakes behind most avoidable losses.
Fish acting off? Grab the 25-point checklist
Email it to yourself and check water, oxygen, feeding, stocking, and emergency warning signs in the right order.
What’s inside the 25-point checklist
The checklist is split into the areas that actually decide whether fish live or die — so you can scan it in two minutes and know exactly what to check. It covers water parameters and safe ranges, a realistic maintenance routine, oxygen and temperature, stocking and feeding, and an emergency triage section for the moment something looks wrong.
Who it’s for
It is written for beginners and anyone who has lost fish and does not know why. If you have ever stood over a tank Googling symptoms at midnight, this is the page that would have saved you. No jargon, no fear-mongering — just the checks that matter, in the order that matters.
Why a checklist beats guessing
Most avoidable fish deaths come from missing one quiet problem — an ammonia spike, a stuck heater, low oxygen — until it is too late. A checklist turns that guesswork into a routine you can actually follow, so small problems get caught while they are still easy to fix.
Frequently asked questions
Is the Aquarium Survival Checklist really free?
Yes. Enter your email and the printable checklist is sent straight to your inbox at no cost. It is the same system we use to diagnose failing tanks.
Do I need experience to use it?
No. The checklist is written for beginners and walks through each check in plain language and in the right order, so you do not need to know the science to follow it.
What does the checklist actually cover?
Water parameters and their safe ranges, a daily, weekly, and monthly routine, oxygen and temperature, stocking and feeding, and emergency triage steps for when a fish looks sick.
How do I use it?
Print it and keep it near your tank. Run through the relevant checks on your normal schedule, and use the emergency section the moment a fish looks off. It is built to be scanned in minutes.
What the survival checklist helps you catch
Most beginner tank crashes come from a short list of preventable issues. The checklist is designed to slow the process down so you check the invisible causes before guessing.
- Water safety: ammonia, nitrite, nitrate, chlorine, and temperature swings.
- Oxygen problems: gasping fish, weak surface movement, clogged filters, or warm water holding less oxygen.
- Maintenance gaps: missed water changes, overfeeding, dirty substrate, and filter media cleaned too aggressively.
- New-tank mistakes: adding fish before the cycle is ready or stocking too quickly after a water change.
Print it, keep it near the tank, and use it before every major change. The best emergency is the one you catch while it is still small.
How to turn the checklist into a habit
The survival checklist works best when it becomes part of regular maintenance, not something you open only when fish are already dying. Keep it near the tank and run through the same order each week: livestock behavior, temperature, equipment, water tests, feeding, visible waste, and plant or algae changes.
The order matters because it moves from urgent to routine. Fish gasping, a dead fish, a heater failure, or unsafe ammonia needs attention now. Nitrate, algae, dirty glass, and plant trimming can usually be handled more calmly. Sorting problems this way keeps small maintenance tasks from distracting you from true emergencies.
If you share tank care with another person, the checklist also creates consistency. Everyone can see what was checked, what changed, and what still needs attention. That prevents double feeding, missed dechlorinator, forgotten water changes, and other simple mistakes that cause real tank problems.
After the checklist is complete
Once the checklist is complete, write down what changed. Note test results, water-change amount, temperature, fish behavior, and anything unusual you saw. Those notes make the next problem easier to solve because you can compare patterns instead of starting from memory. A simple log also helps you see when the tank is improving, even if the water or fish behavior is not perfect yet.
Need help right now?
Fish already acting sick?
The free checklist helps you spot hidden problems. If fish are gasping, dying, hiding, flashing, or you are staring at the tank and not sure what to do next, DBC Aquarium Rescue Help is a $29 practical tank review.
Here is what I would check first: test results, recent water changes, temperature, filter flow, new fish, medication, and the exact symptom you are seeing. Send those details and I will help you sort the most likely problem from the noise.