I would also stick to what you have and try to save money rather then spending money on ADA Amazonia. Your PH like some have said is good enough for crs. I have mine in 7.5 and I just swapped it out with ADA waiting for the ammonia to drop.
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*Tank*
20Gal Long - ADA Amazonia II Substrate - Diy Co2 - Pagoda Rocks - coralife 2x18 T5 - aquaclear 50 - Rena 200 Air Pump - Azoo Sponge Filter 3.
*Plants / inverts*
CRS - CBS - RCS - Pygmy chain sword- moss ball.
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