Hi Bianca;
Just saw your recent pictures of your tank , it looks much cleaner that i thought ,the fish look generally in good shape ,it is stocked to the max but that is ok ,the recent additions seems to be the cal prate ,you have started the treatment with protozin so i would continue till the end , you have got a lot of positives like BB tank that will help you to keep your water clean.
let us know how you go