You can get ready made tank from LFS or you can customize one. They do small tank, even 1ft tank. There is no magic size, all depend on the scape you want to do. I personally like shorter tank, make the scape look panoramic.
There was another person asking for similar question, I cut and paste my reply
For planted tank, you need to get the right equipment and material. Roughly below is what you need.
1. Light, not too much and not too little. Too much (too bright) light and you will invite algae, too little and it wont reach the bottom.
2. CO2, get pressurize CO2 with solenoid regulator even if your plant is not demanding or low tech tank. Plant will benefit from CO2 regardless species and light setup.
3. Water flow, plant do not have hand and leg to capture nutrient, you need to bring the nutrient to them by water flow. Typically 8-10 time your tank water volume will provide enough flow to the tank. Otherwise you can also add wavemaker or powerhead to improve the flow
4. Substrate/Soil, get fertile soil with high CEC (cation exchange capacity) this will allow you some slack in fertilizer dosing. ADA soil is one good soil, there are other soil but I never try, cannot comment.
5. Fertilizer dosing depending on your light intensity.
6. Temperature, plant are more difficult to handle at higher temperature.
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