Fish Treatment Guide
Explore 18 condition references. Compare signs, check possible causes, and understand what to discuss with a fish-health professional before choosing treatment.
Free aquarium utilities
Plan, stock, and maintain your aquarium
Use Fishician's free planning and care tools without a subscription. Sign in only when a feature needs to save private aquarium history or personalized results.
Tank Treatment Guide
Explore eight common water and system problems. Start with measured conditions, investigate the cause, and plan corrections suitable for the animals in your tank.
Aquarium Builder
Plan an aquarium setup with tank measurements, equipment categories, and a stocking list before you buy.
Aquarium Calculator
Calculate aquarium volume, substrate amounts, and water-change quantities from the measurements you enter.
Equipment Guide
Review filter, heater, lighting, and other aquarium equipment categories alongside the tank information you enter.
Fish Compatibility Checker
Compare aquarium species records and review potential stocking conflicts before adding livestock.
Fish Feeding Guide
Organize species, life-stage, and food-label checks before establishing an aquarium feeding routine.
Aquarium Label Dose Calculator
Scale the current product-label ratio you enter to an estimated aquarium water volume without product or treatment recommendations.