Have a look now added pictures.
I siphon my sand every week and clean the glass every chance I get it’s my mantle piece lol, it’s literally just a t5 bulb 4ft long it’s the only thing I could get that fit the hood of the tank, the tank is 2ft deep I believe
). Being bleached like that it's very low on zooxanthellae and eating it's tentacles for energy. By feeding you can help provide some nutrients while the zoo population builds up. Regrettably if there is absolutely no zoo left to repopulate the nem dosent have much of a chance. If it starts gaining zoo it will initially look like there's dirty brown spots on the tentacles, if you hit that point there's a decent chance at recovery. It may still continue to get smaller your goal is to slow shrinking as much as possible and keep it alive long enough for the zoo to repopulate and sustain it.
That nem looks very bleached, otherwise it looks attached, open and not gaping though. Your best bet is probably to keep everything stable and offer a small bit of food every couple days. You can do this by targeting a little twords it like a few mysis and brine shrimp for example (nothing larger than a pencil top eraser) if it dosent take anything don't worry just try again the next day. If it takes some one day I'd skip the next and try offering every other day or so. Digestion does take some energy for nems so small easy to digest things (think nem baby food
GL!
I concur that you don't have enough light and the bleached nem is a H. magnifica.
If you don't plan to purchase new lights for your tank in the near future, I recommend selling the anemone. It won't last more than a few months in the current conditions.
Without the a healthy population of symbiotic zooxanthellae to provide the anemone with the proper nutrition that it needs, you'll need to constantly feed it. Mysis is a good option as you don't want to feed it anything that's too big as it will take up too much energy to digest. Feed the clownfish on the opposite end of the tank, then quickly add the mysis to the center of the anemone. It should immediately close itself over the food.
I have a bleached magnifica that looks a lot like yours, but mine is slowly gaining its zoox population back. You can see the brownish area of tentacles here:
I have the anemone under Radion XR30s that reach 100% intensity on a shallow 12" tall tank. In other words, the magnifica is getting blasted with light. It's the type of light that they need to thrive.
You can always turn your powerheads off for a bit. I do this when spot feeding my corals.
How about a Evergrow IT2120 pro reef marine light?
