07-26-2011, 06:17 PM
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This is exactly the issue that I have been mulling over for a few weeks, though for a different reason. I would like to divides the substrate in my 115g into Flourite or gravel at the back for the large swords, and sand along the front. The problem is that the "divider" must be solid not only from end to end but also along the tank bottom. Sand will easily move through the smallest of openings due to the water movement. Even the gravel in my 115g is always shifting back to front; the rocks do not hold it back.
I had thought of using cork bark; it is realistic, light and easily siliconed together and to the tank floor. Trouble is, I can't find any, even online [though I have not done an exhaustive search]. Rock is another option, chunks of basalt can be arranged as a mini-mountain range, and again stuck together with silicone.
My local importer of many catfish and rays has warned me not to use Eco-Complete due to the sharpness. When I was deciding on an enriched substrate for my 70g, I felt some EC in a local store and to me it was a bit "hard," even through the bag. I went with Flourite, though that has been a disappointment so far for quite another reason.