queue. If you sort through the sometimes confusing FAQs, Immediate Help suggestions or literally hundreds of explanations in comments to article submissions, you would eventually see that the software designers for this and other sites run by Scoop software were hoping that diaries would be short observations or questions up to a few hundred words. Articles might be a thousand or thousands of words in a major opus on some aspect of what the site is about.
Don't assume that a science degree in biology, (physics, chemistry or whatever) means that you friend has had access the correct info or had the time to read over how to set up an aquarium or keep it going. Really brilliant people have not done so well with even guppies because they kept them in too small a tank or didn't keep up with frequent partial water changes using properly prepared water among other things. There are of course lots of other factors for slower growth such as temperature, specific diet, crowding...)
Fancy guppies are probably more vulnerable to trouble than are many other aquarium fish because of their finage. Fins like theirs are not "natural" and happen to be even more vulnerable to pollution and bacterial infection than many other aquarium fish.
A good buddy of mine is chair of a science department at a local university. He has it all over me in many, many areas of life (intellectually, spiritually, as a father, socially, in terms of looks, probably athletically, yada, yada, yada...) But he mentioned not long ago that he never was able to keep his kids' fish alive in an aquarium. ;)