Clams are a little different from corals and anemones....first off the main difference id anemone don't rly on calcium or alk
compared to corals....clams on the other hand rely on even more calcium and alk
than corals, which is why they are considered harder to most corals. If i were you i would try a Crocea clam. They are a smaller clam which wont require as much nutrients and only grow to about 4". Maxima's on the other hand can get huge and are a little more tough Imo
. I have a 75 gal
reef which i do 20 gallon WC
every month along with a BH2000 PS and a Biopellet reactor, i also dose 2 part along with having an ATO and GFO
reactor. My Clam is purple with Blue speckles which i love....i got him at a swap for cheap, I'm pretty sure around 35$. If i were you i would give it a go....keep in mind that clam need great light and good quality water, i too have a LED
's i built myself at 3wtt a bulb. Also remember if they aren't on a plug and you place them on a rock or the sand that will most likely be their permanent pos due to their plate that attaches firmly, if you try to remove it you will likely damage it and kill the clam....similar to pulling an anemone off a rock. Clams also like to be fed, not like mysis or food like that, but almost like a rotfilers etc.., ill take a look at what my bottle is called when i get home and lyk but i dose it 3x a week. Another thing to take into thought is that some fish will nip at corals like pygmy angels and butterflyfish. My flame angel is a model citizen in my tank for almost 2 years and only nips at chalices and acans. The way you described your tank i would go for it, the worst that could happen is it doesnt do good and then you know your not ready for them yet, if they do perish they dont release alot of nitrates/ phospates b/c some odd percent off them are water....they mostly have a low amount of flesh. Anyway GL with the clam at least thats my imput.