Pocket Marine is an essential tool for all marine aquarists. We offer a great deal of information on a vast amount of marine fish, invertebrates and coral. We aim to help you as hobbyist, stay well informed with all the information you need to care for and successfully keep a beautiful and thriving marine aquarium at home. We have over 400 species of fish, 60 species of invertebrates and more than 40 species of coral with more being added regularly, each with a quick tips section for on the spot reference and a detailed information section to know as much as we can offer about each species.

Much more than just an encyclopedia of species, Pocket Marine offers plenty more essential tools that are almost a must have for marine aquarium keeping :-

• Encyclopedia of Marine Fish
• Encyclopedia of Invertebrates
• Encyclopedia of Coral
• Tank detail tracking
• Aquarium Testing Journal
• Trend / Graph plotting for your test results
• Inhabitants Journal
• Scheduled Notification for Reminders
• Compatibility of Species
• Essential Calculators
• Water Change Log
• General Maintenance Log

Graph Analysis - From within your tank journal you can view a graph for all of your results. With a graph plotting your last 6 tests taken you can compare and see how stable your aquarium is or exactly what needs to be amended or tweaked. Stability is key when it comes to home reef aquariums and knowing how your tests measure up against one another is a vital key to successful reefing.

Tank Test Journal - Help keep track of your vital aquarium tests and when they were performed, and makes them accessible at all times. Ranging from the standard ammonia, nitrite and nitrate down to sodium, lithium or cadmium for those that prefer the in depth scientific testing, we are almost certain we have a place for all marine aquarium test results.

Inhabitants Journal - A handy way of keeping track of when and how species were on the day of purchase or before, allowing you to keep important information such as where a species was purchased, were they showing any stress signal signs, approximate size, quarantined and much more.

Scheduled Notifications - An easy way to remind yourself of that vital water change in a weeks time, to manually dose calcium or simply to clean the front viewing panel. All in a simple viewing table with a countdown to your upcoming notifications.

Species Compatibility - One of those overlooked parts of the hobby. Check here to ensure your existing species will generally be OK with that new purchase you are eyeing up.

Calculators - Bringing 4 regularly used equations at the touch of a button. Calculating things such as water volume and water weight is now easy as a touch.

Water changes Log - Often a painful process, more so for the recording of them rather than the doing them. Our water change section gives you the ability to store your water changes with all of the vital details such as amount changed, salinity before and after and even percentage of the aquariums water changed. We also have an automatic reminder for those slightly forgetful aquarists who need a nudge to remember when the next water change is due.

Maintenance - Often one of those, jot down on paper moments. Maintenance jobs such as dosing or cleaning are often one of those that need to be maintained at certain intervals. Our maintenance section logs each task performed by date so we shouldn't miss any future tasks going forward.

Pocket Marine brings you the most vital information on aquarium know how and aquarium tracking, directly to your device.

What’s New

Version 4.1

- UI amendments for a smoother experience, predominantly for the SE device

As always, a huge thank you for the continued use of Pocket Marine and any comments, reviews or feedback etc is always welcome

Ratings and Reviews

4.8 out of 5
187 Ratings

187 Ratings

Nfg1 ,


This app is very handy for recording your maintenance history including water changes and a plethora of water quality tests performed. Good basic info on a variety of livestock available to the hobby with detailed information that is well suited for the novice or intermediate reefer...Great for the low tech hobbyist. It seems the developers have a very solid vision for this sweet little app. They are actively updating it regularly and so I cannot wait for full maturity! Thanks.

Mel- Zo ,

Good for basics

This app is good to keep track of inhibitants and aquarium maintenance. However, when you put in more than one of the same species of fish at the same time, it only shows up as one fish. Ex: my trio of scissortails only showed up as one fish even though I entered three on the quantity. It also doesn’t take into account the different fish of the same type in comparability. Ex. Wrasse are not compatible with wrasse. You don’t have an option to add what kind of wrasse and sometimes they are perfectly safe together depending on species. Good for basics. Not good for details. Hope this helps.

Developer Response ,

Hi Mel-Zo,

Appreciate you taking the time to review us. In regards to adding multiple inhabitants of the same species we completely understand the query. We purposely only add one inhabitant even when entering more than one within the quantity field. This was made this way so those that wish to only have one view for multiple of the same species could do so and those that wanted multiples could add them separately, ie to add a harem of 5 clowns to input them 5 times separately, whereas some can just add once and put the quantity to 5 as they may all come visibly the same and enter the tank/quarantine the same. We went with this as it was the best way to satisfy both queries but completely understand it may be frustrating this way.

We are going to add this to our list of things to address, hopefully very soon we can have an option to add the amount entered in the quantity or just one species but give you as the user the option.

We are also currently working on the compatibility utility. It is pretty standard when it comes to fish compatibility but with thousands of species available we went with our general recommendation rather than an exact species match. Much like those from the internet they tend to give a general opinion as a safety net. This is being worked on to allow users to select individual species and compare between the two though and will hopefully be finished very soon.

Very much appreciate your review though and hope to accommodate the queries in an upcoming release very soon.

Thank you
Pocket Marine

Geckos96 ,

Great app

I really enjoy the app. It helps keep track of testing and maintenance. It also provides a lot of information in regards to species. I would like to see more categories on the calculator such as ppm to dkh or NO3- to NO3. Little things like that would help so that the app can be used for any test or parameter measurement. I also think it would bring a little more content to some of the thinner features in the app.


Liam Salmons
44.9 MB

Requires iOS 12.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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