no. this one appeared 10 days after i started the tank. if there are more eggs , i would probably see more in a few days.
The answer i got yesterday to my second email was very laconic too. use insecticides. i don't like the idea at all.
i will wait a bit more time before introducing fish.
i am in no rush, i rather have a well balanced planted tank than a non stable one due to incorrect usage of insecticides.
i am not going to take so drastic measures like adding toxic chemicals to the tank. no way. it will probably kill the bio-filter and do some other harmful stuff. i don't have gravel. I use Red Sea Flora Base substrate. and any chemicals might penetrate this substrate. (though acetylcholine inhibitors usually self decompose within a few days)
i think its much safer to wait and be patient than interfere the cycle of nature.