does sandblasting sand cause ph problems with freshwater, or should I use something like Tahitian moon?
< The only problem with sand blasting sand is that it is crushed quartz so the individual particle are angular and sharp so they have a tendency to lock together to prevent water flow. An ideal medium would be something that is well rounded and have good porosity.> I want seriously explore this and possibly change the freshwater scene forever, but I want to be sure I’m not treading already known territory of course if it works I’ll still do it! anyway thank you < You will have to aerate the water as it comes out through the DSB or nothing will live in the refugium. For more info on filtration go to Marineland.com and check out Dr. Tim's library.
