Like the title said, I went to the old mom and pop store that I first started going to around 12 years ago. I ran into the actual owner for the first time in a very long time. We got talking, (of course we were excited to see each other) I (being me) broke out the pictures of my first tank to show her how much the fish have grown. I purchased the majority of them from her. It was her next comment that threw me, she said my tank is severely UNDER stocked. I didn't know that could be a terrible thing? So now I'm left wondering if I should be looking for more fish for it and if so, with the fish I currently have how will I find what could be compatible?? Heres some back ground on my tank in question. It's a 65 gallon tall, running two whispers 60's it homes two rosaline sharks, an albino rainbow shark, a red tailed shark, a dragon fish, a syno cat, a blood parrot, an albino butterfly algae eater, a royal pleco, a clown pleco and an assortment of snails. I'm lost as to what would work in there, tetras or anything small will get eaten, theres already many bottom dwellers, and I'm really not sure..?? Anyone have any ideas? Or should I just let the comment slide? I really respect her experience, thats why I'm questioning my set up now. She said my tank looks empty and by adding more it will make the original fish healthier and happier. Any feedback would be appreciated thank you.