The split is not a fixed recipe, because frogs live very different lives. A semi-aquatic frog that hunts along pond edges wants roughly half its floor as water and half as land. A land-loving frog such as a dart frog wants the opposite emphasis: mostly planted land, with a shallow dish it can sit in rather than swim in. A fully aquatic frog flips it again, needing open water through almost the whole tank and only a small platform or floating cork to rest at the surface. Start from your species' wild habits and let those set the proportions.
Building the Land Side So It Stays Dry Enough
Land that sits in constant contact with tank water turns to swamp within weeks. Raise it properly: a false bottom or a deep drainage layer of coarse gravel under the soil keeps the land mass above the waterline, so the substrate stays moist rather than sodden. Slope the bank gently into the water instead of building a cliff, because frogs are clumsy climbers and a steep edge becomes a drowning risk for a weak or sleeping animal. Pack the slope with securely placed stone, cork bark or a pre-formed background ledge, and test that nothing shifts when pressed. Plant the land side with sturdy live plants or solid artificial ones, since cover at the water's edge is exactly where a frog chooses to sit and wait for food.
Setting Up the Water Side for a Frog, Not a Fish
Frog water needs to be clean but gentle. Use dechlorinated water always, because chlorine and chloramine damage the permeable skin frogs breathe and drink through. Keep the depth modest — around chin height at rest for a semi-aquatic frog — with the sloped exit in easy reach from every part of the pool. A small filter or a sponge filter keeps water moving without a current the frog must fight, and partial water changes with matched, treated water keep waste from building up in a small volume. Never add a deep, steep-sided water bowl to a land frog's tank as an afterthought; a dish it can climb out of easily is the safe version of the same idea.
Humidity, Heat and the Daily Rhythm
A lidded tank holds the humidity frogs need, with ventilation balanced so the air stays fresh rather than stagnant. Gentle heat from the room or a low-powered source on the land side creates a mild gradient, letting the frog choose its temperature by moving between bank, plants and water. Mist the land side to keep it damp, and watch where the frog actually spends its day during the first week — an animal that never enters the water may find it too deep or too exposed, while one that never leaves it may be too dry or too warm on land. Adjust the split and the furnishings based on that behaviour rather than on how the tank looks to you. Recording who misted, who changed the water and what the frog is doing in KinsLe Care Teams turns those early adjustments into a shared routine everyone in the house follows.