A day as an Aquarium Technician
The fish get the attention, but you're the reason they're still alive tomorrow. An aquarium technician keeps the water right and the machinery running behind every tank, which means more time with pumps, pipes and test kits than with animals. This day follows a technician on the life support team at a public aquarium, the setting most postings describe.
From the first water test to the last walkthrough
Rounds before the doors open
You walk the back-of-house corridors with a clipboard or a tablet, checking every system you're responsible for. Pump pressure gauges, flow meters, the level in each sump, the oxidation reduction potential readout on the ozone contact chamber. You listen as much as you look. A pump that sounds rougher than it did yesterday usually has a reason, and you'd rather find it now than at noon.
Water chemistry on the bench
Back in the water quality lab, you run the morning samples. Ammonia, nitrite, nitrate, pH, alkalinity and salinity on the big marine exhibits, sometimes phosphate and copper on quarantine systems where a treatment is running. Most tests are colorimetric on a photometer, with a refractometer or a conductivity probe for salinity. You log every result in the water quality database, because the vet team and the curator will look at the trend, not just today's number.
The backwash that turns into a leak
You're backwashing a sand filter on a coral system when a PVC union behind it starts weeping. Now the plan changes. You isolate the loop with the ball valves, drop the flow on that side, and put a tub under the drip while you figure out whether it's a bad O-ring or a cracked fitting. It's a cracked fitting. You cut it out, dry-fit a replacement, solvent-weld it and wait for it to cure, while an aquarist keeps an eye on the tank's temperature because the chiller loop shares that line.
Mixing salt and prepping quarantine
After lunch you mix a batch of artificial seawater in the big holding tanks, dosing salt mix into reverse osmosis water and circulating it until salinity and temperature match the system it's going into. Then you help set up a quarantine tank for fish arriving next week: plumbing a small canister filter, seeding it with bacteria, and checking the heater and the UV sterilizer before anything goes in.
Work orders and the handoff
The afternoon ends at the computer. You close out the morning's work orders in the maintenance system, note the replaced fitting and the part you pulled from stock, and flag a pump seal that's due. You write a short handoff for the evening technician, who'll check the repaired union overnight. Then one last walk past the big exhibit, looking at water clarity and fish behavior, before you head home.
How this differs from the aquarist down the hall
At a lot of aquariums, the aquarist cares for the animals and the technician cares for the systems the animals live in. Aquarists feed, target-train, do health checks and dive to clean exhibits. You keep the pumps, filters, ozone, chillers and plumbing going, and you're usually the one who knows what every valve does. The line blurs at smaller places, where one person does both, so read the posting carefully. If it mentions life support systems, water quality testing and preventive maintenance, it's this job. If it mentions diets, enrichment and animal husbandry, it leans toward aquarist. There's also a whole other version of the title at service companies, where you drive a van between offices, restaurants and homes, cleaning and servicing tanks for clients. That job is more customer service and less heavy plumbing, and you're mostly on your own for the day.
Three ways people end up in the pump room
From a biology or marine science degree
A lot of technicians studied marine biology, aquaculture or environmental science and took a technician job to get inside an aquarium. The chemistry transfers well. The plumbing and electrical side you pick up on the job, and you should say plainly in interviews that you're ready to learn it.
From the trades or facilities work
Maintenance techs, pool service workers and people with HVAC or plumbing backgrounds do well here, because the hardest skills to teach are mechanical. You'll need to learn water chemistry and how sensitive animals are to small changes, but hiring managers often prefer a good mechanic who's willing to learn the biology.
From a fish store or a tank service company
Years of keeping reef tanks, working at a local fish store or servicing client aquariums count for more than people expect. You already know protein skimmers, sumps, reverse osmosis units and how a tank crashes. Put the systems you've run on your résumé, with the equipment named.
Questions people ask
Do aquarium technicians need to scuba dive?
Not always. Some aquariums want technicians who can dive to fix intakes, clean overflow screens or swap equipment inside large exhibits, and they'll train you to their dive program's standard. Others keep technicians dry and leave diving to aquarists. If you already hold an open water certification, mention it, since it makes you easier to schedule.
Is it a good job if I mainly want to work with animals?
It depends how much you mind that the animals are mostly on the other side of the glass. You'll watch them closely, because behavior tells you when the water is off, but your hands are on pumps and test kits. People who wanted hands-on husbandry sometimes use this job as a way in and move to an aquarist role later.
What does on-call look like?
Most life support teams rotate on-call so someone can respond to alarms overnight and on weekends. Alarms go to your phone from the building's monitoring system: a high temperature, a low sump level, a pump that tripped. Many are quick fixes by phone, but some mean driving in at night. Ask how often the rotation comes around before you accept.
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