Saltwater Fish

Dive Deeper: Info & Tips for Choosing Saltwater Aquarium Fish

Saltwater fish are the heartbeat of every marine aquarium, bringing color, movement, and personality to your underwater world. From hardy beginner fish to exotic showpieces, the right livestock mix can transform a glass box into a thriving reef ecosystem or a stunning fish‑only display. This collection is your one‑stop resource for buying saltwater fish online, featuring a curated range of reef‑safe community fish, nano favorites, and bold non‑reef‑safe predators. Whether you’re stocking a 20‑gallon nano reef or a 300‑gallon showcase, you’ll find species here that fit your vision.

At Top Shelf Aquatics, every fish is proactively treated in copper and closely observed to ensure it’s eating and behaving normally before shipment. Our goal is to give you healthy, vibrant livestock that thrives from day one—so you can focus on aquascaping, water quality, and enjoying your slice of the ocean at home.

Match the fish to your tank. Consider adult size, swimming style, and temperament. Active swimmers like tangs need long tanks with open water, while perchers like gobies and blennies are perfect for smaller systems.

Plan for compatibility. Combine peaceful reef‑safe fish with similar temperaments. If you want predators, dedicate a separate FOWLR (fish‑only‑with‑live‑rock) tank to avoid issues with corals and invertebrates.

Stock slowly. Adding too many fish at once can overwhelm biological filtration. Introduce new fish in stages and quarantine when possible.

Feed for health and color. Offer a varied diet—frozen mysis, enriched brine, quality pellets, nori, and occasional treats—to support vibrant coloration and strong immune systems.

Featured Categories in This Collection

Beginner Fish: Hardy, peaceful options like clownfish, royal grammas, and gobies—perfect for new reefers.

Nano Fish: Compact species such as firefish, basslets, and shrimp gobies that thrive in tanks under 40 gallons.

Reef‑Safe Community Fish: Tangs, chromis, anthias, and wrasses that coexist with corals and inverts.

Exotic & Showpiece Fish: Rare angels, butterflies, and anthias that become the centerpiece of large displays.

Non‑Reef‑Safe Predators: Triggers, puffers, lionfish, and grouper for dedicated FOWLR systems.

Ideal Parameter Range

Salinity: 1.023–1.026
Temperature: 75–80 °F
pH: 8.1–8.4
Ammonia/Nitrite: 0 ppm
Nitrate: <20 ppm (reef) / <40 ppm (FOWLR)
Calcium: 400–450 ppm
Alkalinity: 8–12 dKH

Stable parameters are more important than chasing “perfect” numbers. Regular testing and water changes keep fish healthy and reduce stress.

Setting Up an Aquarium for Saltwater Fish

1. Cycle the tank fully to establish beneficial bacteria.
2. Provide oxygen and flow with quality return pumps and powerheads.
3. Use live rock for biological filtration, shelter, and natural grazing.
4. Quarantine new arrivals when possible to minimize disease risk.
5. Introduce fish gradually, starting with peaceful species before semi‑aggressive ones.

Feeding Saltwater Fish

Most marine fish thrive on a mix of frozen and prepared foods. Herbivores like tangs need daily nori; carnivores such as wrasses prefer mysis or finely chopped seafood. Feed small portions 1–2× daily and adjust based on fish activity and nutrient export capacity.

Why Buy Saltwater Fish From Us?

• Copper‑treated & conditioned: Each fish is proactively treated and eating before shipment.
• Expert packing & fast shipping: Industry‑leading DOA rates and insulated packaging.
• Species diversity: From common staples to exotic show fish, all under one roof.

Support & guidance: Experienced aquarists ready to answer compatibility, feeding, and acclimation questions.