So far, i've used Sudo Reef Sand for my freshwater tanks without issues, from my own tests and actual usage i've found that its relatively inert and doesn't seem to affect the water chemistry significantly.
You can check out my test and comparison of it in this thread: http://www.aquaticquotient.com/forum...Sudo-Reef-Sand!
Btw, do wash the sand thoroughly to clear away any residual dust and contaminants/particles before usage.
For the ones selling at C328 in plain sealed plastic packs without any brand or name, you'll have to check with the LFS aunty or uncle. If in doubt, just do a soak test in a cup of water for 1-2 weeks and see if it affects the water parameters.
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