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Aquarist skills: what to learn first, and what can wait

Hiring teams want proof you can keep water stable and animals eating, not a list of species you admire. Start with testing, cleaning and feeding routines you can describe in detail. The harder technical skills, like running life support and planning a new exhibit, come later and are what move you up.

4 open jobs

Step one

Gets you the interview

Water quality testingYou should be able to run ammonia, nitrite, nitrate, salinity and alkalinity tests with a kit or a photometer and explain what a bad reading means.

Nitrogen cycle and biofiltrationAlmost every water problem traces back to how waste is broken down, so panels expect you to explain cycling a new system in your own words.

Routine husbandry and cleaningSiphoning gravel, scrubbing acrylic, changing filter socks and mixing saltwater are most of the day, and volunteer hours doing them carry real weight.

Open water scuba certificationMany public aquarium postings list it as a requirement, so without it you're filtered out before anyone reads the rest of your résumé.

Step two

Gets you the offer

Quarantine and disease spottingRecognizing ich, fin rot, gill problems and odd behavior early, and keeping gear separate between systems, shows you'll protect the collection.

Diet preparation and target feedingWeighing portions, handling frozen food safely and feeding predators, grazers and filter feeders differently is daily work the team needs covered.

Basic life support troubleshootingKnowing how pumps, sand filters, protein skimmers, UV sterilizers and chillers connect lets you catch a failure before the animals feel it.

Husbandry record keepingClear notes in the facility's database, often ZIMS or a shared spreadsheet, let the vet and the next shift act on what you saw.

Step three

Gets you promoted

Life support system designSenior aquarists help size pumps, plan plumbing and pick filtration for new exhibits, which is where you start shaping the building, not just maintaining it.

Breeding and propagationRaising jellyfish, seahorses or coral fragments in house cuts collection costs and supports conservation programs, and few people can do it reliably.

Collection planning and animal transportSourcing animals, packing them for shipping and acclimating arrivals is curator-level work that needs judgment and a lot of logistics.

Training and supervising staffLeading volunteers and new aquarists through dive protocols and daily rounds is what gets you considered for lead or curator roles.

Certificates worth your time

Certificate	Best for	Effort	Worth it?
PADI Open Water Diver	Anyone applying to public aquariums with dive programs	a few weekends of classroom and pool work plus open water dives	Get it before you apply. It's the entry ticket for most dive roles.
AAUS Scientific Diver	Aquarists who dive regularly at facilities with a formal scientific diving program	a training program run through your employer or a university, usually over several weeks	Usually earned on the job. Worth pursuing once you're hired, not before.
American Red Cross First Aid and CPR	Every aquarist, since you work around water, divers and the public	a single day	Cheap and quick, and some postings ask for it outright.
DAN Emergency Oxygen for Scuba Diving Injuries	Divers and dive tenders	an afternoon	A solid add-on once you're diving often. Some dive programs require it.

Requirements differ by facility and dive program, so check the posting and confirm details with the certifying organization before you enroll.

Put it on your resume like this

Weak

Helped take care of fish tanks at the aquarium.

Strong

Maintained 14 freshwater and saltwater systems, logging daily water tests and catching a nitrite spike that saved a 2,000-gallon reef display.

Questions people ask

Do I need a biology degree to become an aquarist?

Most public aquariums prefer a degree in biology, marine science or a related field, but hands-on hours count heavily. Someone with retail fish store or coral farm experience and strong volunteer time can compete with a new graduate who has never done a water change.

Should I learn plumbing and electrical basics?

Yes, at a practical level. You won't be rewiring anything, but understanding flow rates, valves, unions and how a pump fails makes you far more useful during an equipment problem, and it's the fastest route toward life support work.

Is home aquarium experience worth putting on a résumé?

It can be, if you describe it like work. A reef tank you kept stable, with specific testing routines and a problem you solved, tells a hiring manager more than a line saying you enjoy fish.

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