10$ off of 30$ does not take 20$ off of 60$. So multiple orders might be needed to make best use.
Some deals I saw were
+20 gallon aquarium for 28$ add a filler item for discount
+ 2 - 10 gallon aquarium aqueon are just under 15$ a piece and would need a filler item for discount
+ 10 gallon with hood and light 29$ add a filler item for discount
+ aquaclear 70 filter 39.99 after discount
Not great deals
But some good ones on small items and small tanks