Is it just going to be 1 perc clown ? If it's just going to be 1 perc. you can get a 12gal nanocube, it costs around $180. It comes with - 2x24 watt pc, and in the back has 3 compartment filtration. I think it's 3, I don't have it but i heard it was good for begginers. the light is good enough for a little reef and your perc will be happy. also, it would be good to have a little powerhead. Food Food Food, It's good to have a well balanced nutrition for your fish. You can feed Formula 1 which my clownfish LOVE. I feed mine - mysis shrimp,brine shrimp,krill, formula 1 all soaked in Zoecon. It will raise your fishes immune system. you can also use minced garlic. also if you plan on getting a 12 gallon. I've always followed 1lb per gallon of Live Rock. It gives your fish a hiding space and it's part of your filtration. Goood Luck