204 cards
This deck introduces the foundational concepts behind keeping an aquarium, starting with what an aquarium actually is and the broader hobby of fishkeeping. You'll work through the main categories of tanks, including freshwater, saltwater, and brackish setups, and explore popular styles like community tanks, planted tanks, biotopes, species-only tanks, and reef tanks. The cards also cover the essentials of water chemistry, with a focus on the nitrogen cycle and how ammonia is produced and converted in a healthy tank.
It's a great starting point if you're new to the hobby and want to understand the terminology before setting up your first tank, or if you've recently started keeping fish and want to build a stronger knowledge base. The questions assume no prior experience, so absolute beginners can work through them from start to finish without feeling lost.
Because many of these concepts build on one another — especially the steps of the nitrogen cycle — it helps to study the related cards together rather than in isolation. Spacing your review sessions over several days will give your memory time to lock in the new vocabulary, and trying to explain a term in your own words before flipping the card is a good way to check that you really understand it.