Getting other slower feeders like
Macropharyngodon should help as well, generally it’s not just the wrasses that outcompete with
Pseudojuloides species though and other fish can do this too.
One thing you need to be cautious with if you plan for a clam is some fish do nip on their mantles and annoy them.
In this list, you shouldn’t have that issue however remain cautious with the Pseudojuloides as these can sometimes nip mantles (Although this is rare).
In terms of beginner Clam I would say either a Deresa or a Squamosa. These guys have lower PAR needs as they’re found in deeper waters. However the issue with all Tridacnids is they tend to grow large, Deresa is the second largest in the genus and gets to around 18-24” after a few years. Squamosa is close behind Deresa and gets to 16” after a few years. Both of these clams have growth spurts and are not slow growers when they do have spurts.
I have 2 clams in my collection - A
T. deresa and a
T. maxima. The deresa is beautiful but in the top photo you can just see the growth it’s had in the last 6 months alone. My Deresa as you can see is on the sand bed and these can be in a minimum of 250 PAR, but seem to grow best under 300-350 PAR.
With clams, their biggest need is light and flow. They don’t seem to enjoy low flow but also don’t like their mantles being constantly lifted. Mine seem to enjoy their mantles being lifted every so often but not at a constant rate.
This is my Maxima, he’s higher in the tank and under around 375-400 PAR.