Nano tank help is needed?

The algae on the gl is often from sunlight and high nitrates. What kind of light are you using? Does the tank get hit by sunlight from windows? How are your nitrates? Snails are great at eating the algae and keeping the gl clear. Water circulation can help. What is your current water movement in gph? How old is your phosphate remover? It is a chemical filter and will wear out and potentially can leach undesired and sometimes dangerous elements back into the tank. If over a month old, throw it away.