I was having the same issue between 29g and 20g. I chose to go with the 20g and I realized that unless you are planning on keeping big fish, which you are not, there's no real reason to go with a bigger tank. And if you have a budget like me, I'm just going to say even though I went with the 20g, I still went way over my budget. Smaller is cheaper, because all the necessary components are cheaper for smaller tanks(light, filter, heater, etc.). Have fun with your new fish tank!!
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