i see what you mean (without being rude ofcourse)
try a black background this enhances all the colours in your tank, your wood looks great, take some of the moss from one tank and attach it to the other tank piece of wood.
you defo need some tall tanks to go in with the angels,this should be good as you got deep substrate in there, you can get some really easy to grow ones that look great arfter about a month or so afew large rocks would do justice, try this with fast growing plants and hey presto all will be sorted. add some tank plant fertilizer to speed up growth of the plants