Hello, I'm still new to this, but starting to find that i need to be really thoughtful about what i buy so that i get things that will get along. I have a 200L tank - 2 clown fish, 2 fire shrimps, 3 turbo snails, 3 narcissus snails and 4 yellow tail chromis, 1 chalk goby. I have a few problems... 1) How can i work out / plan what would go well? I'm looking for some more 'pretty' fish but always seem to find they are then not reef safe. 2) What else would go with a chalk goby for sand sifting... i used to have 2 but just one isn't coping with keeping the sand clean. 3) How can i maximise the number of "things" in the tank so that there is lots to look at. 4) What do you think a limit would be on things to put in? I plan to get more coral as well, and currently only have a few things in. Thanks.