Hello, i got my little niece addicted to fish tanks. I built her a 5 gallon planted tank with 1 betta, she loves it. Now i told her we will build another, she’s excited, but its really for me. Do you think a 20 gallon long with 1 apisto, and 3-4 diamond tetras and lots of plants is doable in a 20 gallon long ? Any info will be appreciated, thanks Terry