u/Fabulous-Pound-3375

Hey! I have a 20 gallon long with 8 otocinclus, 4 celestial pearl danios, and 12 harlequin rasboras. Planning on getting 8 more celestial pearl danios. Is this tank overstocked as is or is it fine to get more? Mind this is a heavily planted tank with a 50 gallon rated filter and the parameters are perfect.