I have a bunch and they are all different.
Some like higher light and some like lower light. Some do well in higher current (not high it is a lps) while others detest it. You may move have to move it up or down to find what it likes. Shrinking usually indicates either to much light or two much flow.
It is a LPS so it so it polyps are fleshy and can not take to much of a beating. Except maybe Goniopora like stutchburyi can handle higher flows because of its shorter smaller polyps.
Also a coral will shrink its surface area to get less light if it is getting to much. A soral will expand to increase surface area to collect more light.
As far as food I believe gonis require it and some do better with it. I believe in feeding them for best results.
Problem with gonis is they all seem different in their eating habits. Some can grab food, some put out slime nets.
Determining what they eat is the hard part. I feed a wide spectrum of stuff to them. Reef roids is part of what I feed but it does not work on all of them, some can take larger particles while some really small. I believe some are bacteria feeders and some just might uptake like amino acids from the water.
I try to get a feeding response before feeding by adding a little amino acid and a small amount of food about 10 min before feeding.
I find them very touchy to alk changes or too high or low alk.
Remember there are probably more than 20 species and they are different and come from different areas of the ocean.
The biggest challenge in this hobby is we are trying to keep corals from all parts of the reef together in this little box and most would never be seen together. Some corals die because the condition in our tank will be ok for some corals and not others. Some corals are highly adaptable while others are not.
