scaping comes from you imagination it will come to you as you do it , One thing you need to remember is to make caves hiding spots , be sure to leave places for water to flow through out the rocks so you have no dead spots, use your creativity to build your master piece , I'm sure you don't want a large pile of rock as that's just so boring
you want something that you will enjoy looking at also be sure to leave nice surface area's for coral
this came out of imagination it took me about 10 attempts before I was happy with the out come , I left it just kept looking at it as I saw something that I didn't like I moved it around , 3 years later I saw something I didn't like so I added a big centerpiece rock on the bridge , this pict was taken before I changed it up some I'm not saying pull every rock and start over , it will come to you even if you have a spotter behind you telling you it looks good there or not,
the best part is theirs no wrong way it's what you like , even if you sit and draw a few sketches of the outline of the rock you want to achieve ,
remember if you get frustrated walk away a few minutes stand back stair at it get a idea of what don't look right than fix that section , remember Rome wasn't built in a day