Hi Andre. I also did the exact same mistake you made a few months ago. Saw this "beautiful" white anemone
nono
in the LFS, and just went all in and bought it... Let me tell you, if you have a heteractis crispa, you are going to have a nice couple of months ahead my friend... Good news is, that mine is still alive, and getting better and stronger every day... I have mine for two months now, and only NOW, after really really good care has been taken, and research have been done, I am getting a tiny bit of color in it.
Before you read any further on what I will suggest, you need to decide whether you really want to ride this train... If you are not willing to put ALL your energy in saving this anemone, rather get someone to take it off your hands.
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If you are reading this, it means that you have decided, and that these anemones are now the most important aspect of this hobby to you.
I am not an expert (AT ALL) on this, but I've done some real extensive research on these beautiful creatures. I have some good news and some bad news though...
The bad news is that your'e budget will now change. You will HAVE to get more light. In saying this, PLEASE DO NOT go and take down the 2010 stadium lights in Nelspruit and put them over the tank!!! I have had my Anemone under 2x 24W T5's, and the moment it was strong enough it moved into a much darker spot in the tank. The reason it does this is because it consist (all corals actually) of an algae called zooxanthellae algae. One of a few functions this algae serves, is that it's like sunblock to the anemone. Thus, a fully colored up anemone DOES require A LOT of light...
Good news is, your's doesn't yet... Don't get me wrong, you need to start adding light - as in yesterday. I would suggest adding two more 24W - 6700K tubes and wait. See what the anemone does, for about a week. If it doesn't move, introduce two more 24W T5's. Just make sure the anemone has a cover of some sort to move to if it feels like it.
One thing you should understand, that even transporting this specific type of anemone under the utmost of best conditions, they still bleach...
On feeding... I feed my Anemone daily - at night when the lights are down, as it then extends the tentacles much further... Anyway, I would recommend chuck the hake... Go to your LFS, and after you broke your foot off in the salesman's behind, ask him to give you krill or stint (silversides.) These are VERY high in protein, and I think will "feed" the anemone a bit better. It's like Riced Crispies vs Mieliepap - which one feeds you best?
You are more than welcome to contact me with any questions relating this - but just do me one favor: PLEASE DO YOUR BEST TO SAVE THESE CREATURES?!?!?! They are not just any or another sea creature, they actually are propably many many years old, and they can actually live much longer than we can ever imagine. So give me a call please, there are som many things I might be able to help you with.
I will PM you my contact details...
Good luck