Hey Steve to be honest when it comes to my investment in the hobby I don't trust anyone but my self. In the last 15 years I've been doing reef tanks I've found out that ever tank is diffrent and requires different needs. With testing a visual inspection is how I decide what my tank is going through.
Here's some info I pulled up
Stichodactyla Haddoni
Common Name: Haddon's Sea Anemone
Phylum: Cnidaria
Class: Anthozoa
Subclass: Hexacorallia
Superorder: Hexactiniida
Order: Actiniaria
Suborder: Nynantheae (Thenaria: Endomyaria)
Family: Stichodactylidae
Species: Stichodactyla haddoni (Saville Kent, 1893)
As Discosoma haddoni, from specimens collected on the northern Great Barrier Reef
Other name previously used include:
Stoichactis kenti (by Friese 1972, Moyer and Sawyers 1973), S. gigantea (by Friese 1972), S. haddoni (by Uchida et al. 1975, Moyer 1976, Moyer and Steene 1979).
Diagnostic field characters:
Slightly to deeply folded oral disc lies on or above sand surface; tentacles either bulbous or with basal "stalk," at the end of which is a blunt or swollen terminal portion that can appear puckered (on close examination). Exocoelic tentacles more robust than the endocoelic ones with which they alternate. Column sturdy.
Details:
Oral disc diameter commonly 500 mm, rarely 800 mm; yellowish to orange tentacle-free oral area 10-20 mm in diameter. Oral disc, lower portion of tentacles, and column drab -- commonly yellowish or tan. Tentacle ends can be green, yellow, gray, or rarely pink, which can give oral disc a variegated appearance. Exocoelic tentacles usually white, may be up to twice as long as endocoelic, point outward in well expanded animals. Tentacles sticky to touch, may adhere to human skin so strongly that they pull off the anemone; contact with them is painless but can raise welts. Small, non-adhesive verrucae on uppermost column are same colour as column or light rose to purple. Anemone can pull rapidly and completely beneath the sand when disturbed, leaving its fish to hover over the resulting depression.
Similar species:
Stichodactyla gigantea also lives in sand but typically in shallower water, and folds of its oral disc are less regular and more closely spaced. The oral disc of S. mertensii, which lives on firm substrata, lies fairly flat. The column of S. haddoni is more substantial than that of either, and its tentacles are longer and distinctively shaped. The other species lack robust exocoelic tentacles. Tentacles pull off of S. gigantea as well, but in massive clumps rather than one or several at a time.
Stichodactyla Mertensii
Common Name: Merten's Carpet Anemone
Merten's Sea Anemone, Non-Stinging Carpet Anemone, Spotted-Base Carpet Anemone
The Merten's Carpet Anemone is the true giant of the clown fish anemone hosts. The largest of the carpet anemones, it has a deeply folded oral disc that can grow to a diameter of up to 3.3 feet (1 m). They are named Carpet Anemones because they grow wide rather than tall and are so covered with tentacles that they look like a 'plush' carpet. The oral disc of the Merten's Sea Anemone is green, cream, or yellowish in color with tentacles tipped in white, yellow or green. Its column is whitish or tan with sticky verrucae (bumps) that are tan, magenta, or orange. These adhesive verrucae, being under the oral disc edge, hold the disc in position.
Although the Merten's Carpet Anemone does not sport as many colors as other carpets, it is similar in overall appearance to the popular Saddle Carpet Anemone S. haddoni and the Giant Carpet Anemone S. gigantea. This often leads to confusion and mis-identification. An easy way to distinguish between them is by the environment where they are found. The Merten's is always in the midsts of rocky substrates or coral while the others are most often found in sandy areas.
Besides coloration, there are some visual characteristics to help identify each carpet species as well. The Merten's Carpet Anemone has less tightly packed tentacles and it can grow much larger than either of the others. Its oral disc is deeply folded, which differentiates it from the Saddle Carpet Anemone whose folds are less deep, lending a wavy appearance to the anemone. The Merten's Carpet Anemone often spreads out to blanket the surrounding substrate, while the Giant Carpet Anemone is rarely held flat against its surrounding surfaces. The Giant Carpet Anemone also has sticky tentacles while the Merten's does not.
The Merten's Carpet Anemone should only be kept by very experienced aquarists. Besides its large size, this is a much more delicate carpet anemone. In general they do poorly in the aquaiurm. They are rarely imported, but they need very dedicated care when they are.
I think the best way u can help the specimen is to test ur water and find out ur perimeter.