My chaeto was growing very weel for about 3 weeks. Now it is beginning to be covered in slime and GHA is growing well. I scraped the fuge last night and removed most of the GHA. I cut the light time from 10hrs down to 6. Should I rinse the chaeto out before my next water change? Can I add the extra special grade sand I have left over, or should I get oolite sand, and why a fine grade sand for fuges?


