Hi there, so I bought some zoas a few weeks ago but my amphipods aren't allowing my zoas to open by constantly walking on them, they don't seem to be doing it on purpose it's just there's so much of them. I've checked at night to see if there's nudis or picnagonids but there aren't. I've dipped them, nothing. My tank is 20 years old and is a 50 gallon corner. Are there any predators for them, my clownfish seems to not want to eat them and CBS doesn't eat them as often. Thanks.