A sequence is increasing if an < an+1 and decreasing if an > an+1 is what i believe is correct, if not please correct me

With this problem an = 1/(2n+3) , (n is a subscript on the left and not the right.)

I checked it by doing:

1/(2n+3) 1/(2(n+1)+2)

1/(2n+3) < 1/(2n+5)

In this shouldn't this be a increasing? But the answer is indeed decreasing? Am i missing something? Thanks in advance for your help.