Self funded 20 gallon long

Hi guys!, being a young reefer (under 13) and seeing the 1$ per gallon sale at Pet co, I got a 20 gallon long! I know it will be a slow process because a cant just make money in my basement. I bought the tank and I am now making money to get the light. It will be a coralife t5 30". I know fluorescents are not he best but I can't afford LEDs or halides. But I have a question on stocking. I am for sure to get a baby yellow four spot wrasse. What else should I get? Please no gobies. Thanks!