I have recently decided to rescape my 180l, I've replaced the previous mismatch of substrates with dennerle 10 in 1, nyasa sand and tropica soil: used to create a mound at the back and somewhat stupidly capped with sand, more by accident of losing control of the 20kg bag. My Kribs have helpfully dug a pit into the aqua soil, no biggie as the goal in this tank is to go biotope (ish) and my little rainbow Kribs will eventually have a tank of their own. I digress. So I've been agonising over what stone to use, I want something light and fairly inert, dragon stone is my go to, but I just don't want it in this scape, I want pebbles and boulders to replicate a stream. So what I should of done is get all my materials together first and not act like a 5 year old and go crashing straight into substrate replacement, needless to say I went crashing in. I have some lovely bogwood and I will arrange these so they flow with the vallis at the back. Do I need the rock? I'm unsure if a stream style biotope will work with out it, I plan on dumping a butt load of oak and beech leaves in with some more botanicals to get my tannins going. I don't know kind of rambling now, so yeah rocks for a stream scape, wholly necessary? Any nice alternatives to pebbles and boulders? Fish will be Pentazonas and Harlequins with two krib squatters until I sort them out their own tank. I'll post some pics once I've sorted the bogwood situation out and my plant order comes in.