Hi, I'm very new to fish so forgive my ignorance. I purchased a 2nd hand 38Litre tank about a month ago, at first I added an apple snail, then was given 2 black sailfins and an orangish one. I've had them for around 3 weeks, then about a week or 2 later I was given 2 Kribensis from someone who needed them gone. I took them being none the wiser and told they'd be fine with community fish etc. I'm still lacking knowledge but believe my tank may be massively too small! am I right? I think I also shouldn't have added fish so close together That said, they all seemed happy until tonight when I found my orangish one looking rather miserable and I'd think unlikely to make it with fins all torn up I've put him in a separate tank so he's not being picked on but am wondering the best way to go about things from here. Do I need a bigger tank? what size should I be looking at getting? thanks