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Mine and others I have seen open like a daisy. Strait stalk and a flat open pedal like head. They look like trumpets. I’m not saying it’s wrong. It’s just not what I have seen
However I stand corrected. I just did an internet search and most I see do have a trumpet head. Apparently... mine are odd. I will take a pic when I get home
They typically don't like a lot of flow...may be pulling in to avoid it. Here are mine...in an area of rockwork that blocks most of the flow off of them
Sorry those pictures suck, I forgot to put my filter on. I'd give a lower flow area of your tank a shot to see if they do better. Here's a better shot of mine.