Sounds like a possible Malu Anemone? If so then its one of the hardest to keep healthy
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You may have it placed far from everything at the moment but if its not happy whereit is it will simply move to whereever it wants to go. This means your corals and tube worms are liekly to be in its way as they cant "walk".
A UV light is not the type of light needed to keep an anemone. Totally the wrong colour temperature as this is high ultra violet whereas the anemone needs as close to 6.5k yellow light.
There also is no guarentee that it will host the tomatoe clown. In fact if the anemone is the wrong type it will just as easily eat the tomatoe rather than let it host in it.
Anemones can also get killed easily with heaters and powerheads. Heater remain swithced off for lng periods of time, an anemons can easily move over a heater whilst its off but once the heater turns on it cannot get off and thus gets cooked! A similar problem with powerhead... they can easily get sucked into the powerhead and die.
As i have said many times, anemones are not recomended for reef tanks, they eat fish, move around and sting all in their path and wont live long (considering in the wild this creature will be around long after your great great great great grand children have passed on )
Some people keep them and they are well behaved, Ihave one that crawled out of some liverock as a tiny polyp but i would never purchase one nor would i even entertain one just to host for a clown,. As mentioned before a better option for clown is the Sarcophyton as it needs weaker lights and doesnt sting or move around... Oh and it doesnt eat your fish!
You mention you have UV lights? Im assuming you mean an actinic? a UV light is usually used for strilisation andnot lighting a tank as the UV radiation will kill everything. It might just be a US terminology that im not familiar with of course but in either case this lighitng is not good enough for an anemone.
Lastly.. should the anemone settle down in your tank, be prepared forit to grow very fast. after all its simply a bag of water and can double or even treble its size in only a matter of weeks should it try to expand. If you have weak lighting then it will try to maximise this by growing large to gainas much from the lights as possible. this means less swimming room for your other fish
Im really sorry and please do not take offense when isay this but it will really helpyou and your tank if you have a quiet word in your parents ears and ask themto either research their purchases very very carefully or ask you in advance before buying. One of these days you might find they get something that is really going to be very dangerous for your tank (Oh look that lovely green mantis looks so cute!
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I hope it works out well for you.