Scooter blennys need a live food and they only eat pods
. So you need a established refugium for pod population. Then Lawnmower blennys can eat some coral.
If you want a reef tank this means its all about the coral. Coral put little load on your system but need feeding. They eat many of the type of food that fish eat so having a few fish would help. So think of fish as part of the cleaning crew. A few for algea and or snad cleaning and 1 or 2 for eye candy.
You want to add the least aggresive fish to the most aggresive , so planning your stock upfront makes it easier.
Its best to start with a few CUC then wait and then add a fish or coral then wait and add another fish or coral then wait and add more CUC then wait and add more coral.
THen you want to feed 4 or 5 type of food and feed lower amount smore aften helps.
Then good water flow and rock placement play a big part along with tank maintance and water source.
Its about many things working together for best success.