His arms are a brown color and seem to be wilting his arms are now staying up without the chopsticks but his color is yellow and brown. i give him UV light daily for 12 hours a day. I just repotted him again.

2 days ago and he is looking worse

I'm not sure the problem then. Hopefully someone will come along tomorrow and offer a suggestion.

Is it Fairy Castle Cactus - botanical name Acanthocereus tetragonus (some disagreement about the classification exists)?

Looks like it has fake (straw) flowers glued on...

It shouldn't need any sticks for support.

Yellowing could be from little light but you say it is under lights for 12 hrs/day, so maybe not. Another reason for yellowing is overwatering and/or poor drainage. Brown could be from rot that is associated with overwatering. Plant gets also soft, sometimes squishy.

Potting mix seems to be just a potting soil - it should have much more of sifted perlite or pumice in it. Like 50% or even more. Look at the photo - it could be even more...It also looks like pot is too big. Large pot = lots of soil, & if it is not draining well, it stays moist for too long. Is there a drainage hole(s)?

You said you just repotted - did you get rid of all old soil? And how did the roots look?

I did not get rid of all the old soil. the roots looked okay to me. He has been in this pot now for a little more then a year i just took him out checked roots and took off soil that was stuck to him and put in new soil. i have pumus rocks in the middle and it has a drainage hole on the bottom.

I can try more sun

I took off the flowers today but he had thhosw for the past 3 years since i got him

Diana Harman

Those flowers are not really hurting it; it just looks fake to me with them on...what do you mean by..."i have pumus (I assume it is typo & you mean pumice) rocks in the middle"...do you mean rocks inside/middle of the pot? If YES, they don't help. You need better mix - something like pic below:

...or even more gritty - add some gravel if you have any. If you don't have it, make sure it is t least as much as photo shows, or add more. Let mix dry out between watering. Test mix for moisture before watering.

These are my cactus roots. i unpotted him and put him in his old pot with new soil. do you think there is anything else i can do?

If that‘s all the roots, it’s not much and a smaller pot might be best as Rina said. Clay pot with a hole is good. If you are going to give more light, transition slowly. I have a fairy castle cactus, and in full sun it does not look too green, more browny yellow. Not sure that's what you have though. Good luck. Don‘t overwater.

Yes to what socks said. Roots should be healthier & more of them. Good news: they could regrow! Just get lots of sifted perlite/pumice added; don't overwater & keep where it gets morning sun (I wouldn't expose it to harsh mid-day sun). I would use smaller pot...