i would recommend about getting a tank 2 foot tank (2foot=60cm) i think these are a good started size tank this is what i started off with. i still use this tank as a community. but i do have a bigger tank now. but for the smaller tank u could get about 10 small neon tetras and 1 or 2 clown loaches and maybe 1or 2 bristle nose catfish. also 2 or 3 dwarf gouramis. and have plenty of small plants in the tank and have some rocks and drift wood. If you do want to get a bigger tank i think a 4 foot 1 is a good size (4foot = 120cm) with this tank just go to google and research mbuna community tanks and that will give u some ideas. good luck!!!!!!