Why is my RFA looking like a toadstool?

Silverlava

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My RFA has been looking "taller" lately. Almost looks like the shape of a toadstool mushroom. Instead of nestling down into the sand, he's stretching vertically. I thought the other RFA next to him might be crowding him out, so I tried moving him at night, when hes usually really extended like this. He just sucked down all the way to the glass and I didn't want to blindly pull and injure him.

All levels are normal, and the other three rfa's look great.
dKH- 10.5
Ca- 450
pH- 8.1-8.2
Mg- 1440-1500 (two test kits, they disagree)
Nitrates - 0

We had a fifth rfa that had been looking unhappy. My best guess is bristleworms or something were living under him and he couldn't move away. We also had a day where my mobius app went rogue and turned the light on for an extra 5 hours until we noticed. I moved that one and he melted overnight, so I'm concerned the same might happen here. I did swap out the phosphate reactor (it was 4 weeks old and due anyways), added a carbon reactor, and did a 20% water change after the rfa died.

PXL_20240413_132709578.jpg PXL_20240413_132233010.jpg PXL_20240413_132235906.jpg
 

HOW MUCH DOES A FISH’S FEEDING REQUIREMENTS AFFECT YOUR STOCKING DECISIONS?

  • A lot! - I avoid fish that require frequent or specialized feeding

    Votes: 6 28.6%
  • Quite a bit, but an automatic feeder can change my answer

    Votes: 4 19.0%
  • It depends on whether my nutrient export can handle it

    Votes: 4 19.0%
  • It depends on how badly I want the fish

    Votes: 6 28.6%
  • Not much. I’m willing to adjust my routine

    Votes: 4 19.0%
  • Not at all. Feeding demands don’t limit my stocking choices

    Votes: 4 19.0%
  • I usually learn about the demanding feeding schedule after buying the fish!

    Votes: 1 4.8%
  • I haven’t really considered this before

    Votes: 1 4.8%
  • Something else (see my comments in the thread)

    Votes: 0 0.0%
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