Aquarium equipment guides
Sourced spec explainers for the equipment most beginners actually buy. Sizing math, the spec hierarchy, and the failure modes worth knowing about before you spend money — sized for the tank in front of you, not generic buying advice.
Heater buying guide
Wattage math, submersible vs in-line, accuracy specs, and the failure modes manufacturers don't put on the box. Includes the redundancy logic for tanks above 75 gallons.
Filter buying guide
GPH math, HOB vs canister vs sponge, why the box rating overstates real flow, and maintenance behaviors (rinse-in-tank-water, no-cartridge-only HOBs).
Buying guide → sizing math
- Heater path: heater buying guide for product tiers and failure modes → heater-sizing calculator for the wattage your tank actually needs.
- Filter path: filter buying guide for HOB / canister / sponge hardware → filter-flow calculator for the working GPH after the rated-vs-actual gap, and the filter-types guide for what each type physically does.