Pool filter sand is nothing like playsand, don't confuse the two, you're talking quite a few millimeters difference and it makes a big difference in compaction. Even then, I have swords busting out of tanks that have nothing but play sand (fine silica), and no ferts at all. I've had them grow like crazy in high tech tanks too, with Eco. It's all personal preference IMHO. Get some Malaysian Trumpet snails if you're worried about compaction. You can get nasty anearbobic spots in Eco too, over time. I'm guessing a third of Eco is finer than PFS, if not finer than play sand.
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