sIx line too aggressive, especially for nano tank. This may introduce stress to other tank mate. You can consider yellow wrasse but bear in mind wrasses are good jumper. Need to take precaution. Cheers
Try live food 1st, like brine shrimp, mysis & pods. You can try LCK201 for live pods & mysis. After that slowly move to frozen food & algae.
Cheers and Happy Reefing..