Good afternoon. I have been dealing with dinos for months now. My NO3 is 10, PO4 is .03. I have a 25 watt UV with new bulb and the tank is 70 gal actual volume. Ive been dosing silica, working to keep the dinos in the water column, etc. Nothing has helped. The dinos do disappear at night but come right back at daybreak. Thank you for any help or suggestions