As JohnHuff saids, it takes a while. It took a little more than a month for a healthy presence of algae to be noticeable in my little 435 gallon watergarden and I was intentially adding ammonium hydroxide to seriously jumpstart my bacteria so I could add many fish very soon. Once algae starts appearing, then it seems to take just a week or more for it to appear when there is a transition between algae species. I have not yet experienced these perfectly clear to "all of a sudden over night pond filled" algae blooms, which makes me wonder about their testimonial's honesty describing their clear water in the first place.
Your turn over rate (i.e., rotation) is just fine. I am actually using one 3630 gph pump and another 600gph pump for my 435 gallon watergarden, but only a portion of this flow is diverted to my bio-filtering.
If you want the water to mature naturally, then it is quite natural for fish to die as the water is maturing; so, prepare your self on the occasion when they do die. If you do not want to take the "all natural" approach, then when you notice your fish becoming lethargic or ill, then think about brushing up on how to conduct and understand water chemistry test kits and how to react to the results. Test strips are fine, but the more common API Freshwater Aquarium Liquid test kit is much better and can be commonly found in big pet retail stores. This API test kit does not have everything, but it contains the basics to get you started and pay attention to instruction, otherwise you risk the chance of contaminating the results. Also, there is a good chance one of the big pet retail stores can test your water for just a couple bucks; I often use them as a second or thrid opinion that is then compared to my own tests. If ya have a question, scan the forum a bit then ask away if ya can't find the answer.
Good luck.