GHA Outbreak

[Swbvegas]

Went on vacation, came back to a GHA outbreak... I cleaned my canister filter and my 2 HOB filters... yeah I know the filtration is not ideal but I'm unable to add a sump to this dumb petsmart tank I bought 3 years ago. I'm eventually going to swap tanks to an AIO or something better.

Anyways, I need help... I know I need to pick as much out as possible but what else can I do? My nitrate is at 30! I'm planning on doing a 15g water change today and another tomorrow. Also considering getting rid of my Valentini puffer who keeps killing my clean up crew.

 

[Swbvegas]

 

[KyleC]

My tank is covered in GHA at the minute! I was going to get a lawnmower blenny, but then read they don't really go for GHA... following to avoid duplicate posts.