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Substrate materials

	I have tracked down a gravel with a good grain size, (2-3mm) 
and was wondering about some of the long term substrate additives on 
the market. I have used Duplarit-G in the past and this does not seem 
to be as available since Dupla no longer has a US distributor. Have 
people any opinions of the other products?

1) Seachem's fluorish
2) 100% laterite (Aqualine Buschke?)
3) Terralit (AB)

Any others? What exactly is Terralit? What are the pros and cons of 
these different additives? Thanks!

Alok Chaudhari