Oh, I wasn't questioning you! I meant the product descriptions I've read 
I think I might know what part of the problem is.. for the sake of an experiment, can you try increasing the feeding (very gradually) first to once a day and them to twice per day? Keep a very close eye on the readings, especially on ammonia and nitrite.
If you can get a timer, I would like to suggest aiming for no more then 12 hours of light.
Yes, you water is hard.. but personally, I think that in the long term that won't be a problem once everything settles in.. you know that RO water essentially does not contain anything at all? Which means it don't contain minerals and trace elements which the plants and fish need for their health, so you would need to mix those back in when doing water changes (for example by mixing RO water with tap water). It is up to you if you use it, but personally I prefer to leave it as a last resort.
And if for some reason don't want to do the experiment I suggested, do get some plant fertilizer.. be careful as some are known to not work with Vallis. sp. (read ‘make Vallis melt’).
I think your problem might possibly lie in low feeding: you need to constantly be providing enough ammonia to keep the filter going, as well as spare which will be converted into ammonium for the plants etc. Because of low feeding and high pH, there might only be enough for just the filter and the plants are essentially starving. Also the plants aren't helped by the long hours of light (this might be affecting the fish too) in combination with almost no food.
How are the fish doing?
I think I might know what part of the problem is.. for the sake of an experiment, can you try increasing the feeding (very gradually) first to once a day and them to twice per day? Keep a very close eye on the readings, especially on ammonia and nitrite.
If you can get a timer, I would like to suggest aiming for no more then 12 hours of light.
Yes, you water is hard.. but personally, I think that in the long term that won't be a problem once everything settles in.. you know that RO water essentially does not contain anything at all? Which means it don't contain minerals and trace elements which the plants and fish need for their health, so you would need to mix those back in when doing water changes (for example by mixing RO water with tap water). It is up to you if you use it, but personally I prefer to leave it as a last resort.
And if for some reason don't want to do the experiment I suggested, do get some plant fertilizer.. be careful as some are known to not work with Vallis. sp. (read ‘make Vallis melt’).
I think your problem might possibly lie in low feeding: you need to constantly be providing enough ammonia to keep the filter going, as well as spare which will be converted into ammonium for the plants etc. Because of low feeding and high pH, there might only be enough for just the filter and the plants are essentially starving. Also the plants aren't helped by the long hours of light (this might be affecting the fish too) in combination with almost no food.
How are the fish doing?
