nagual

So yeh I can well imagine that some peoples Discus have spawned successfully in water with PH levels higher than 6.2. I found that after a dozen spawnings, lowering the PH was the only thing that worked for mine. It's well known that Discus can survive in almost any type of water and since my last batch of young I havent bothered to adjust the water in my tanks and have been doing water changes with aged tap water so I'd say the PH is currently around 6.8 and everyone looks happy. But notably there have been no spawnings since. It might have something to do with the conditions the parents were spawned under, I really don't know but if you want to try absolutely every possibility then lowering PH is one option. Good luck once again and keep us posted.

Be careful what you add to your tank to lower the PH if you havent already gone about doing this. Make sure the product you use contains NO PHOSPHATES, because in a low PH/ Phosphate rich environment, algae will go crazy on you. Not sure the actual type but I think its Volvox. In any case what happens is your tank turns bright green and resembles a very thin pea soup. Although not harmful to the fish, it is unsightly and stops you seeing whats going on. It can be cleared up by massive water changes and using phosphate cleaning pads in your filters (can ya tell I'm talking from experience? ), but the best thing is to avoid that extra cost and work from the outset. Just remember - NO PHOSPHATES!

So dont flame me if I come across as a dork ok? Anyway only thing I can suggest is PH level. It took my Discus over 12 spawnings to produce young and it wasn't until I lowered the PH to 6.2 (normal PH in my tap water is 7.2 !!!) that they stopped eating both the eggs and fry. But having said that, theres also something to what ajbroome said about age because my fishes are at least a year old now and have been "trying" for over 6 months . Good luck with them.