I have some berghia nudibranchs for sale they are around 1/4 inch long 5 for $100 pick up in astoria queens they will eat your aptasia
PM Me if interested
They are hands down the best thing if you have an aptasia problem! Definitely need more than 1 though. Had 4 of them for my 75 cube, after they cleaned that out I put 2 in the over flow and 2 in the sump. Gave them to my cousin after they did their job. Haven't seen aptasia in months