I am not saying the products don't work they do for some people in certain situations. But they are not needed for most people in my opinion as your tank will have plenty of food without adding them. I keep my tank additions simple as I like to control the input into my tank and keep my output high. The only products I use on a regular basis are Kalkwasser, buffer 8.4 by brightwells, Prime and Mag. I do use the occasional food like Reef Roids as a treat and to vary the diet of my corals but I really limit its usage as those products are very nutrient dense and accumulate quickly in a tank. If you are running a ULNS these type of products can help but if you are not they can lead to trouble. So it really depends on your situation.
If you have a productive refugium with macro algae and areas of low light that help foster cryptic loving creatures like sponges, this will provide the nutritious live food for your fish and corals and help filter your water. Most people don't need to rely on most of the products around for a healthy thriving reef. Especially if you are doing your water changes regularly like you are.
Take the amino LPS, what are the chances that only LPS use the amino for that product? Not very likely. Other things like algae will use them as well to fuel growth. Like Kyle1970 said in a small tank a little goes a long way. So if for any reason your usage rates change and you are using that type of product you could run into trouble very quickly in smaller systems. If you have growth issues you can always get products like that and use it as a treat but I would not recommend using the amino products on a regular basis unless it is needed like for a ULNS and the corals are obviously showing signs of color loss.
I myself don't like to waste money on products I don't need just because manufactures created new products to sell to me that they say I need. Forget that.
