07-10-2009, 12:56 PM
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Originally Posted by abunari
Thanks that helps alot. I will have to go out and do a rock hunt to test what will work and make my angels happy.
With angels I would forget the rocks and use bogwood, more natural to them. And they are more settled with plants. Re the gravel, the regular aquarium gravel [comes in natural (buff/brown mix) and sometimes darker (grey/black)] are safe, they are quartz and will not leech anything into the water. The dolomite and crush coral gravels will leech calcium and raise pH and hardness, they are meant for livebearers (if you have acidic water and need to harden it for livebearers), rift lake cichlids and marine tanks. Coated gravels have ben know to break down, i have had this occur as have others. Personally I would not use a coated gravel in my fish tank, not worth the risk; it may take years...but who knows? Rocks that are calcareus (like limestone) do raise hardness and pH. Any from outside should be used with extreme caution, they may have absorbed pesticides, oils, chemicals and scrubbing will not resolve this.