Quarantine Checklist for Beginner Reefers

For most beginner reefers, a 10 to 20 gallon fish quarantine tank works for clownfish, gobies, firefish, and small wrasses. If you plan to quarantine larger fish like tangs, use a 20 gallon long or larger so stress and ammonia spikes are easier to manage.

Fish quarantine often involves medications like copper that can permanently contaminate porous materials and harm corals or inverts. Keep coral frags, snails, shrimp, and macroalgae out of any tank that may ever be medicated.

Avoid setting the quarantine system directly under or beside the display where splashes, wet hands, or shared towels can transfer pathogens. Even a few feet of separation and dedicated tools lowers the chance of accidentally moving disease into the reef.

Beginners often spend everything on the display and livestock, then skip quarantine because they do not have a heater, test kits, or extra salt mix. Plan for the tank, sponge filter, lid, medications, buckets, and backup water so you are not improvising after fish arrive.

Observation-only means watching closely for symptoms over 2 to 4 weeks, while prophylactic treatment may include copper for ich and velvet or praziquantel for flukes. Beginners should choose one approach ahead of time so they have the correct test kits and understand the risks.

It is easy for first-time reefers to forget when a fish started copper, when the last dose was given, or how long a coral has been pest-free. A simple log avoids guessing and helps you complete a full quarantine period instead of ending early.

A bare bottom makes it easier to siphon uneaten food and waste before ammonia rises. It also prevents substrate from absorbing medications or hiding parasites where you cannot monitor them.

The biggest beginner quarantine mistake is starting with no biological filtration and watching ammonia climb above 0.2 ppm. Keep a sponge filter or ceramic media seeded in your display sump ahead of time so the quarantine tank starts with nitrifying bacteria.

Keep fish quarantine at 77 to 79 F for most common reef fish unless a species needs otherwise. Beginner heaters can drift, so a separate thermometer catches dangerous swings before stressed fish stop eating.

Many stores keep fish at 1.020 to 1.023 SG, while reef displays may run 1.025 to 1.026 SG. Starting the quarantine tank close to the arrival salinity reduces osmotic stress, and you can raise it gradually over several days if needed.

Firefish, wrasses, gobies, and even clownfish can jump when startled in a bare quarantine tank. A lid is a cheap piece of insurance that prevents overnight losses during the most stressful period of acclimation.

PVC pieces give fish shelter without absorbing medications or trapping waste like live rock can. Beginners often see better feeding and less pacing when fish have a dark place to retreat.

A small clip-on light or ambient room light is usually enough for observation and feeding. Bright reef lights are unnecessary for fish quarantine and can increase stress in newly shipped fish.

Even beginner frags can carry flatworms, nudibranchs, vermetid snails, or algae that become major display tank problems later. A small separate system with flow and stable salinity lets you inspect and observe corals before they enter the reef.

Many beginner corals do fine in the 50 to 150 PAR range during quarantine, depending on species. Starting lower and increasing slowly helps avoid light shock, especially after shipping or dipping.

A coral dip can remove many hitchhikers like flatworms, nudibranchs, and pods, but it will not kill all eggs. Follow the manufacturer instructions exactly and rinse corals in clean saltwater before placing them in quarantine.

Eggs and pests often hide where beginners do not look, especially around glue seams and shaded tissue edges. If possible, remove or replace the original frag plug to reduce the chance of bringing pests into the display.

Some pests are not obvious on day one and may only appear after a feeding cycle or after eggs hatch. A patient observation period is far cheaper than treating an entire display tank for AEFW, monti nudibranchs, or invasive algae.

Inverts cannot be exposed to copper or many fish medications, and macroalgae can carry nuisance hitchhikers. A simple invert holding container with heater, flow, and observation time helps protect your display from pests and contamination.

Ammonia can spike fast in a small bare-bottom tank, particularly if a new fish is not eating and food is left behind. Keep ammonia at 0 ppm, and treat any detectable rise as a warning to feed less and change water.

Beginners often let small tanks swing because evaporation happens quickly. Top off with fresh RO/DI water daily so salinity changes do not stress fish that are already adapting to a new environment.

Quarantine tanks in closed rooms can run low pH because of poor gas exchange. Gentle surface agitation and fresh air help more than chasing pH with additives in a small system.

Frequent small feedings encourage shy fish to eat while limiting waste buildup. This is especially useful for finicky beginner species like firefish, royal grammas, and some captive-bred fish that need time to settle in.

These are some of the first visible signs of ich, velvet, flukes, or bacterial stress in quarantine. Daily observation matters because velvet can progress quickly, and beginners often mistake rapid breathing for normal shipping stress.

When fish stop eating or symptoms change, a clear log helps you spot patterns like worsening after a dose or improvement after a water change. Good records also prevent accidental overdosing in small tanks.

Shared equipment is one of the most common ways beginners accidentally transfer pathogens from quarantine to the display. Color-code or label tools so there is no confusion during water changes and feeding.

Wet hands can easily move contaminated water, especially if you adjust equipment on both tanks during the same maintenance session. This simple habit adds a strong extra layer of disease prevention.

Move fish or corals with a specimen container or gloved hand if appropriate, but leave quarantine water behind. This reduces the chance of carrying in parasites, medications, or concentrated waste.

Many beginner losses happen because fish appear fine after a few days and are moved too soon. A proper quarantine period gives time for hidden diseases and coral pests to show up before they reach the display.

A fish that only picks at food in quarantine is not truly ready for the competition and activity of a display tank. Look for several days of strong feeding response on pellets, frozen food, or the diet you plan to use long term.

Do not move a coral just because it survived the dip. Wait for stable tissue, no new bite marks, and no visible pests during repeated checks so the display tank is not used as the test environment.

After a quarantine cycle, clean equipment and allow the tank and tools to dry thoroughly before the next use unless the system is being kept running intentionally. Resetting the system lowers the chance of carrying forward lingering pathogens or pests.