important

Does anyone know what may have caused my Torch to do this? He was fine a few days ago, noticed he was somewhat leaning so I righted him and the head facing upwards has just deteriorated

Hey guys, So ever since this pandemic, I haven't had access to quality filtered RODI water and instead, I've been using Brita filtered water to top up my system. I have had an algae explosion and I don't know where to begin and how to clean this up. I was planning on upgrading my system this...