Have come back to discus after a lapse of over twenty years. Used to see fish ike that in the 80's but even then they were not common. Most Heckels I see these days only have dull, partial striations. Those in your tank are first class. Well done!
I like the colour of the sand in your tank, more natural looking than white, although I like that too. You said it is just normal sand. So if I go to my local gardening supplies and just get sandpit sand will that be ok? I currently have a bb but the glass on the bottom is getting alge spots so I need to cover it.