--- product_id: 53908540 title: "ATM Blue Shark (Formerly Colony Marine Rapid Cycle 25 gal Tank Cycle 8 oz" brand: "atm" price: "S$48" currency: SGD in_stock: true category: "Atm" url: https://www.desertcart.sg/products/53908540-atm-blue-shark-formerly-colony-marine-rapid-cycle-25-gal store_origin: SG region: Singapore --- # Add fish same day, instant bio-filtration Authentic nitrifying bacteria strains Cycles aquarium in days, not weeks ATM Blue Shark (Formerly Colony Marine Rapid Cycle 25 gal Tank Cycle 8 oz **Brand:** atm **Price:** S$48 **Availability:** ✅ In Stock ## Summary > 🐟 Cycle fast, fish faster—join the aquarium elite! ## Quick Answers - **What is this?** ATM Blue Shark (Formerly Colony Marine Rapid Cycle 25 gal Tank Cycle 8 oz by atm - **How much does it cost?** S$48 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/53908540-atm-blue-shark-formerly-colony-marine-rapid-cycle-25-gal) ## Best For - atm enthusiasts ## Why This Product - Trusted atm brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Trusted by Pros:** Used and approved by commercial aquariums worldwide. - • **Marine-Grade Strains:** Nitrococcus & Nitrosococcus for superior marine environment performance. - • **Instant Fish Addition:** No more waiting weeks—add fish the same day you cycle. - • **Rapid Aquarium Cycling:** Transform your tank in days, skipping the usual wait. - • **True Nitrifying Bacteria:** Only the right species for effective ammonia and nitrite control. ## Overview ATM Blue Shark delivers authentic nitrifying bacteria strains that rapidly cycle marine and freshwater aquariums in days, enabling immediate fish introduction. Trusted by public aquariums globally, this liquid treatment ensures efficient ammonia and nitrite breakdown with proven commercial-grade performance. ## Description Product Description Colony True Nitrifying bacteria is the industry standard in aquarium cycling, used by public aquariums around the world such as Sea Life Sanctuaries to cycle aquatic systems in days instead of weeks. Directions Maintain average water temperatures of 23-30°C (74-86°F). For best results, maintain a pH between 7.2–8.0. Always maintain a minimum 90 ppm Total Alkalinity. Systems requiring a pH level below 7.2 should be slowly adjusted after ageing/cycling the system at 7.2–8.0 pH. Shake bottle vigorously to mix bacteria. For average water conditions add 118 ml (4 oz) of ATM ColonyTM Freshwater per 95 L (25 gal) of dechlorinated aquarium water (tap water recommended). Dose entire system volume once. Do not overcrowd tank. Prevent ammonia and nitrite spikes by feeding fish lightly when applying Colony. Monitor ammonia and nitrite levels and slightly increase feeding rate after 4 consecutive days of at, or near, 0 ppm ammonia and nitrite concentrations. Gradually increase to normal feeding levels. NOTE: Turn off or unplug UV sterilizers, protein skimmers, and ozone generators prior to and 4-5 days after each introduction of ATM ColonyTM Freshwater. Keep at room temperature and do not allow product to freeze or excede 43°C (110°F). No water changes until after the fourth day when all bacteria has attached. ## Features - CYCLES: The one that works, effectively imports actual true nitrifying bacteria - AUTHENTIC: Other products don't contain the right species of bacteria, Colony Freshwater does! - STRAINS: Nitrococcus & Nitrosococcus for primary ammonia and nitrite consumption in the marine environment - INSTANT: Add fish same day, not weeks later - PROVEN: Used and approved by commercial aquariums ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00YW5SQPA | | Best Sellers Rank | 25,120 in Pet Supplies ( See Top 100 in Pet Supplies ) 251 in Aquarium Water Treatments | | Brand Name | ATM | | Country Of Origin | United Kingdom | | Customer Reviews | 4.6 4.6 out of 5 stars (295) | | Global Trade Identification Number | 00870317004127 | | Included Components | Nitrifying bacteria | | Item Form | Liquid | | Item Type Name | Aquarium rapid cycle | | Item Weight | 0.5 Pounds | | Liquid Volume | 8 Fluid Ounces | | Manufacturer | Blue Shark LLC | | Manufacturer Part Number | 870317004127 | | Model Number | 870317004127 | | Pet Type | Fish | | Target Species | Fish | | UPC | 870317004127 | | Unit Count | 1 count | ## Product Details - **Brand:** ATM - **Item form:** Liquid - **Item weight:** 0.5 Pounds - **Liquid volume:** 8 Fluid Ounces - **Unit count:** 1 count ## Images ![ATM Blue Shark (Formerly Colony Marine Rapid Cycle 25 gal Tank Cycle 8 oz - Image 1](https://m.media-amazon.com/images/I/71H675rbOrL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Can this b used when doing water charges** A: yes but you have to keep skimmers off for 4 days when using it **Q: Can this more then once** A: Yes No need to bacteria grows **Q: My LFS just told me to add a bottle and wait for the ammonia to drop without having fish in cycle, but states adding fish??** A: Yes add whole bottle wait an hour add couple of small fish but don't over feed them **Q: Is this for saltwater tank** A: Yes, I used this when I set up my marine tank and it worked great. I was able to add fish and livestock a lot quicker. ## Frequently Bought Together - ATM Blue Shark (Formerly Colony Marine Rapid Cycle 25 gal Tank Cycle 8 oz - iQuatics Ocean Reef Pro Marine Saltwater Coral Premium Aquarium Salt - 10KG - Refill --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sg/products/53908540-atm-blue-shark-formerly-colony-marine-rapid-cycle-25-gal](https://www.desertcart.sg/products/53908540-atm-blue-shark-formerly-colony-marine-rapid-cycle-25-gal) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-11-09*