Welcome back. I'd turn off the air stone to give the sand time to settle if it hasn't by now. As you know Goldie's are VERY messy so you definitely want the over filtration. You may want to look at a canister filter . . . i love mine on my 46g, I bought it online for way cheaper than a local store. Goldie's need a varied diet to be healthy - veggies/fruit need to be a daily part of their diet. Next big tank I set up I think is going to be for a Goldie, I'm falling in love with them from my readings about them.