my 1st thoughts were get a bigger tank...not being rude, but its a bit small to house much///
but then it may be all the space u can spare 4 a tank...nano cubes were a thing 4 awhile===they were great 4 ocd types(j/k) they had good points & bad points...
look into doing a community tank if u r looking @ it as a primary piece in the family room. u want it to be nice tranquil and enjoyable if u have kids and a wife/husband,,,if not its ur decor
the skys the limit...look @ what others have got posted in the photo contest and go from there, see what tickles ur fancy. either way good luck