---------- Forwarded message ---------- Date: Tue, 10 Dec 1996 10:43:27 -0500 From: NKLujan at aol_com To: Aquatic-Plants-Owner at actwin_com Subject: Tetra's Helina Crypto Does anyone know how closely Tetra's Helina Crypto soil additive resembles laterite? Also, it would seem to me that the circulation created be undergravel heating would be contrary to the desire to maintain anoxic conditions around the plant roots. Any comments? Nathan