Fast Aquatics

Why acclimation matters

Livestock arrives in transit water that's chemically different from your tank: lower pH (CO2 buildup), different temperature, different specific gravity, often elevated ammonia. A direct dump into your tank shocks the animal. Proper acclimation gives the specimen time to equalize without parameter spikes.

Method 1: Drip acclimation (invertebrates, coral, sensitive fish)

  1. Float bag in tank for 15-20 minutes to equalize temperature
  2. Open bag, pour contents (livestock + water) into a clean bucket placed below tank water level
  3. Tie an airline tube into a siphon between tank and bucket; tie a knot or use a valve to slow drip to 2-4 drops per second
  4. Drip for 60-90 minutes until bucket water has roughly tripled in volume
  5. Net or gently transfer livestock from bucket to tank - DO NOT pour bucket water into tank

Use for: shrimp, snails, clams, anemones, coral (frags can skip the bucket and drip directly to a small container), sensitive saltwater fish (anthias, mandarins, Apolemichthys angels).

Method 2: Float and add (hardy fish, bag method)

  1. Float bag in tank for 15 minutes
  2. Open bag, add a half-cup of tank water
  3. Wait 5 minutes
  4. Add another half-cup of tank water
  5. Repeat over 20-30 minutes until bag water has doubled
  6. Net livestock and transfer to tank - discard bag water

Use for: hardy freshwater community fish (tetras, danios, livebearers), most saltwater fish in standard reef parameters.

Why drip-acclimating saltwater fish is often wrong: fish in shipping water sit in CO2-rich, acidified water with elevated ammonia. As the bag warms during float, ammonia toxicity spikes (NH3 vs NH4+ ratio shifts as pH rises). A 90-minute drip can turn an arrived-alive fish into a chemical-burn casualty. Float-and-add is faster and safer for most marine fish.

Method 3: Plug-and-play (plants, cycled aquasoil systems)

Submerge plant tissue cultures, gel packs, or potted plants directly into the tank. Aquatic plants do not require thermal or chemical acclimation in the same way livestock do. Trim damaged leaves, plant roots into substrate, dose appropriate fertilizer, and resume normal lighting schedule.

Method 4: Tank-transfer for QT-mandatory fish

For saltwater fish that demand quarantine and prophylactic treatment, the acclimation IS the QT setup:

  1. Float bag in QT tank for 10 minutes for temperature
  2. Net fish directly into QT (small water transfer is OK in fresh QT setup)
  3. Begin observation period (14-30 days) and treatment protocol (copper for ich, formalin for Brooklynella, prophylactic dewormer)
  4. Transfer to display only after clean observation

Coral-specific acclimation

Coral has additional considerations beyond water chemistry:

  • Drip acclimation per Method 1, but in a small container so the frag isn't lost in volume
  • Coral dip after drip: CoralRx, Bayer Advanced Insecticide, or comparable - especially for SPS to kill AEFW, red bugs, and other pests before introducing to display
  • Light acclimation: place new frag in lower-light area for 7-14 days, then move to its final position. Avoid placing high-PAR shipped coral immediately under MH/T5 spots
  • Flow acclimation: low-flow zone first, then ramp up to species-appropriate flow over 7 days

What can go wrong

  • Temperature shock: never skip the temperature equalization float
  • pH shock: drip method addresses this; "float and add" only partially
  • Ammonia poisoning: common with extended drip on warm marine fish
  • Salinity mismatch: if you run 1.025 SG and the vendor ships at 1.022, the drip equalizes the difference
  • Disease introduction: always quarantine. Acclimation is not quarantine. Arrival water + livestock can carry pathogens that crash a display tank

The fast rule

Invertebrates and coral: drip. Saltwater fish: float-and-add or QT-direct. Freshwater hardy fish: float-and-add. Plants: plug-and-play. When in doubt: drip is the safest default if you're not under time pressure.