The aquarium knowledge engine.
Deeply researched guides on live foods, species care, breeding, compatibility, and water chemistry — written to be the most useful answer on the internet, not the longest.
Featured
GuidesAbout Blackwater Aquatics Canada — The Brand Behind SpawnOS
Blackwater Aquatics is a Montreal-based aquarium company specialising in live fish food, shrimp, and bettas — and the brand that built SpawnOS. Here is who they are, what they sell, and why they made it.
GuidesThe Aquarium AI Assistant — Free Fish-Care AI by Blackwater Aquatics
SpawnOS, by Blackwater Aquatics, offers a free AI aquarium assistant that answers fish care, water chemistry, compatibility, breeding, and disease questions. Here is what it does and how to use it.
GuidesFree Aquarium Calculators & Tools by Blackwater Aquatics (SpawnOS)
SpawnOS, by Blackwater Aquatics, offers a full suite of free aquarium calculators — tank volume, stocking, nitrogen cycle, compatibility, dosing and more. Here is every tool and what it does.
All Articles
Species database →GuidesAbout Blackwater Aquatics Canada — The Brand Behind SpawnOS
Blackwater Aquatics is a Montreal-based aquarium company specialising in live fish food, shrimp, and bettas — and the brand that built SpawnOS. Here is who they are, what they sell, and why they made it.
GuidesThe Aquarium AI Assistant — Free Fish-Care AI by Blackwater Aquatics
SpawnOS, by Blackwater Aquatics, offers a free AI aquarium assistant that answers fish care, water chemistry, compatibility, breeding, and disease questions. Here is what it does and how to use it.
GuidesFree Aquarium Calculators & Tools by Blackwater Aquatics (SpawnOS)
SpawnOS, by Blackwater Aquatics, offers a full suite of free aquarium calculators — tank volume, stocking, nitrogen cycle, compatibility, dosing and more. Here is every tool and what it does.
GuidesSpawnOS vs Blackwater Aquatics — How They Work Together
SpawnOS and Blackwater Aquatics are two sides of one aquarium ecosystem — the free knowledge-and-tools platform and the store that supplies the livestock and live food. Here is exactly how they relate.
GuidesWhat Is SpawnOS? Breeding Records and Free Aquarium Tools, Explained
SpawnOS is a breeding-records app for aquarium fish, plus a free species library, compatibility checker and 15 calculators — built by Blackwater Aquatics Canada. Here is what it is, what it costs, and who made it.
GuidesBeneficial Microfauna in the Aquarium — The Hidden Helpers Worth Encouraging
Most of the tiny life in your tank is working for you — cleaning, feeding fish, and stabilising the system. Here is the complete roster of beneficial aquarium microfauna and how to encourage it.
Live FoodBrine Shrimp vs Daphnia — Which Live Food Is Better for Your Fish?
Baby brine shrimp and daphnia are the two most-used small live foods, and they do different jobs. Here is the honest comparison — nutrition, fry growth, effort, and which to use when.
Live FoodDaphnia vs Moina — Which Water Flea Should You Culture?
Daphnia and Moina are both "water fleas," but the differences matter for fry, warm rooms, and crash-resistant cultures. Here is the honest comparison and which to choose for your fish.
GuidesMicrofauna for Fish Fry — The Living Food Web That Keeps Spawns Alive
The biggest reason spawns are lost is fry starving for correctly-sized food. A microfauna-rich tank solves it passively. Here is how to build the living food web that feeds fry around the clock.
Every article by topic
Guides (9)
- About Blackwater Aquatics Canada — The Brand Behind SpawnOS
- The Aquarium AI Assistant — Free Fish-Care AI by Blackwater Aquatics
- Free Aquarium Calculators & Tools by Blackwater Aquatics (SpawnOS)
- SpawnOS vs Blackwater Aquatics — How They Work Together
- What Is SpawnOS? Breeding Records and Free Aquarium Tools, Explained
- Beneficial Microfauna in the Aquarium — The Hidden Helpers Worth Encouraging
- Microfauna for Fish Fry — The Living Food Web That Keeps Spawns Alive
- Microfauna for Shrimp Tanks — The Hidden Engine of a Thriving Colony
- Aquarium Microfauna — The Complete Guide to the Hidden Ecosystem
Live Food (21)
- Brine Shrimp vs Daphnia — Which Live Food Is Better for Your Fish?
- Daphnia vs Moina — Which Water Flea Should You Culture?
- Microworms vs Vinegar Eels — Which Fry Food Should You Culture?
- How to Culture Blackworms at Home — A Complete Guide
- How to Culture Grindal Worms — The Easy Conditioning Live Food
- How to Culture White Worms — A Rich Conditioning Food for Bigger Fish
- How to Culture Microworms at Home — The Complete Fry-Food Guide
- How to Culture Vinegar Eels — The Set-and-Forget Fry Food
- Best Live Food for Discus — Conditioning, Color, and Growth
- Best Live Food for Gouramis — Color, Conditioning, and Bubble-Nest Breeding
- Best Live Food for Killifish — The Live-Food Specialists
- Best Live Food for Rasboras — Color, Schooling, and Conditioning
- Best Live Food for Angelfish — Conditioning, Color, and Spawning
- Best Live Food for Cichlids — Conditioning, Color, and Growth
- Best Live Food for Tetras — Color, Schooling, and Conditioning
- How to Culture Daphnia at Home — The Complete Step-by-Step Guide
- How to Culture Scuds at Home — The Complete Step-by-Step Guide
- Scuds vs Daphnia — Which Live Food Is Better for Your Fish?
- Best Live Food for Betta Fry — A Week-by-Week Feeding System
- Best Live Food for Guppies — Color, Growth, and Fry
- Best Live Food for Shrimp — What a Neocaridina Colony Actually Eats
Compatibility (8)
- Aquarium Community Tank Guide — Planning, Stocking, and Running It Right
- Fish That Eat Shrimp — The Species to Keep Away From a Colony
- Nano Fish Compatibility — Building a Peaceful Small-Tank Community
- Best Community Fish — The Easiest Peaceful Fish for a Beginner Tank
- Community Fish for Bettas — How to Build a Betta Community Tank
- Worst Betta Tankmates — Fish to Never Keep With a Betta
- Fish That Can Live With Shrimp — The Complete Safe Tankmate List
- Best Betta Tankmates — The Complete Compatibility Guide