To start off. This will be my wife's 30 gallon fish only. She has a problem with feeding. She has a little green spotted puffer and when he eats he gets a little pot belly, Well when he does not eat he is skinny. She does not want him to look skinny and sickly so she feeds the tank. I do weekly 5 gallonn water changes but with the amount of food going in the tankthe nitrates still stay in the 20s. I do not have a skimmer on it right now. I dose my reef tank with vodka. I was wondering if this would help her tank too?