Freshwater aquarium tools, designed from first principles.
About SimplySubAquatics
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On Etsy since 2026
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Simon
Owner, Assistant
Hi, I’m Simon, creator of TankWise and Simply Submerged Aquatics. I build practical freshwater aquarium tools that make tank care clearer, calmer, and focused on what fish, plants, and water actually need.
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Last updated on
Aug 2, 2026
Frequently asked questions
How does this TankWise work with this holder?
The TankWise test tube holder keeps your test tubes, strips, and color chart stable and organized. After completing your water test, use TankWise to scan or manually record the results and track changes over time.