Thank you so much for posting this in action!! I didn't even think about a bent straw. I have a straight one.
We had someone in our reef club in the DC/MD/VA area do that tooIt may not apply for your particular situation since you are growing zoas you want as well, but for those who are reading this and only have pest palys/zoas they want to get rid of, you can always try finding a local hobbyist struggling with/fish store that imports zoas and get zoanthid spiders and zoa eating nudibranchs from them. Both are host specific in their diets, so would die out once their food source is gone, but would eventually eradicate your problem for you.
Do not think a spider decorator crab will solve the issue though! Mine used to steal and then lose the desirable zoas where they'd die in a dark crevice somewhere, but ended up spreading texas trash palys all over the tank via this same method. I ended up hospitalizing myself from aerosolizing palytoxin trying to scrub them off the rock with hot water and a wire brush.
This is how I plan to remove the palys I have that are over growing the tank. They grow too fast.Thank you so much for posting this in action!! I didn't even think about a bent straw. I have a straight one.
I am not even remotely an engineer but I thought flow via suction was purely determined by the smallest diameter (of any appreciable length in a closed system system? I.e. a Venturi/eductor could increase flow at effluent bot other than that the smallest ID determines flow/suction in a passive siphon.
I'd be more worried about toxin release stressing other corals.I love the stainless straw idea. A Majano wand will kill them too just run a lot of carbon while using it. I think sucking the easy ones out with the straw and then scorching the rest with the majano wand would be a pretty solid one two punch.