
I just bought some baby Black Kuhlies, but I have a very old HOB filter that I don't think could handle fine sand, so pool filter sand seems best. I was wondering then, what size grains would be best for both the loaches and the filter? Are any of these good?
http://www.acehardwareoutlet.com/(joxl2 ... ?SKU=83029
http://www.bicwarehouse.com/filter-sand-61308.html
My loaches seem fine moving over the top of the gravel, but I know they could be happier. So far I haven't been able to find any filter sand at the hardware stores in my area.