Hi, I totally agree with the suggestions. However trying to get a book about "nano" tanks will not be easy. But all the other books pertaining to marine tanks will give you a huge wealth of info.
This forum is full of great advice too.
As for the water, I went through the same thing as you are. I had cyano in my tank ( red slime algae) unsightly stuff :sleepy: Hard to get rid of too but I managed to. I was using RO water for a while but what works for me might not work for you.
I use straight distilled water, my nano has been running now for 9 months and everything is doing just great. Mushrooms are multiplying like crazy, I really need more rock badly for them. My xenia is growing great guns so the DI water works great for me. Tap water is fine for the freshwater aquariums like I do have also but for salt do change over to RO or RO/DI you will be glad you did :yes:
As for the fish, now that I have had my tank for 9 months. It houses a tomato clown and one green chromis. If I had an opinion about this I would have to say go with 2 percs or 1 clown and a goby along with your clean up crew. What I am finding right now is my clown is very territorial and at times chases the chromis around. No fins getting damaged here but when they say a 10 just does not give you the room they sure do mean it.
I love my nano and don't plan on going any bigger but really it is meant for one fish or two really small ones and some cleanup crew. Hope your fish do well if you plan on keeping them.
What type of clown do you have in there?
good luck :happyfish