Actually GEX is pretty good substrate to start with.What type of plants you intend to keep also plays a crucial part in nutrient intake.If you're going for an all moss carpet then it really doesn't matter.Cost wise ADA should be more expensive if you're going for the full setup including the various "powders" penac a etc...
As for your setup,what sized tank are you keeping?Glosso does require heavy lighting and co2 to keep them low and creeping.They are available every now and then,have you tried seaview?They might have it...
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