What is causing my ricordia to shrink?

[jmp21677]

I have a 24 nano sps dominated tank. There are three different types of shromms in there as well. The standard purples are doing great. I have a type of yuma that is also doing well. Then there is the small colony of ricordias that are really nice and they aren't doing well at all. I bought this tank from someone else with all livestock and they were find the first 3 months or so that I had it. Since then that have shrivled up and are just not doing well at all. Anyone have any ideas. lighting is a 150 watt sunpod.

 

[jnbrex]

I had a bright green ricordia that was doing great and growing for around six months, then shrank into nothing in a week. Sad to watch, but didn't seem to be anything to do to help.

 

[BlazinNano]

How much flow are they getting? I have heard they like a lot but I do not have any so I am not sure. There are a couple of people on here with full ricordea tanks hopefully they will chime in.

 

[Invert]

Do you have any pictures ?