Stock Question

My 29 gallon biocube finished cycling.
It's been up and running for a month. Now it's time to start stocking. I know a lot of people get inverts first, but I don't have any algae for them to eat. So, what should I put in first? I want to get two clowns, a wrasse, and a goby. Any suggestions on what kind of goby? Could I buy one clown and a coral frag (i.e. a zoo or mushroom) to start and then get a clean up crew a couple of weeks later? Also, a lot of people do water changes after their tank finished cycling. Now that my tank is done cycling, how much should I change? Is it really necessary if my ammonia, nitrite, and nitrate levels are at zero?
 
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