Your start up is magnificent, your levels are perfect, and your cyano
is pretty normal. I wouldn't suggest syphoning all at one time, and this is only because I stalled my cycle at the phosphate stage (with cyano
starting) because I removed too much at one time and didn't have the beneficial bacteria that was covering the cyano
anymore. I know I'll probably get snobbed or trolled for this, but if you get another decent sized aquacultured live rock and chip it into medium sized rocks and leech them you may get some of your CUC for free and live rock has an amazing ability to filter your water.