I hope it's okay posting this in this thread... I didn't know where this belonged.
Info on fish and tank:
36 gallon bow front. Aqueon quiet flow power filter, 200w heater, air stone, water is okay with low levels of nitrate and 0 of ammonia and nitrite. Tank has been running for 3 weeks and I have been slowly adding fish.
5 glofish tetras (white skirt tetras), 5 platys, 1 algae eater.
I thought platys were peaceful community fish... I recently bought 3 from petco. Very healthy and happy looking. I already had one at home. I wanted to have a small school. I went and bought one more the day after because I decided on 5. I noticed shortly after I brought the new ones home the platy that I already had (Winston) had ripped fins... I thought that was odd because all I have in there are white skirt tetras and platys... I had the tetras before with him and he was fine. This didn't happen until I brought the new platys home. There is one big orange crescent one that I think may be the culprit... Also last night my biggest tetra (Packy) got stuck in my castle! It's such a small hole I have no idea why he would choose to swim through it... Unless he was startled or being chased. He is okay... But has some boo boos... I'm really upset. I don't know if I should take the castle back or the fish. My platy Winston is the only one with ripped fins (His dorsal fin).
Should I just monitor them closely and see what's up? I've been watching them though and all I see is light chasing and all of them kind of do this. Is that normal for a community aquarium or is that odd? They are all peaceful variety's... They'll chase their own kind or each other. Kind of sneak up behind one another and startle them, then swim away. The tetras don't chase the platys but they chase each other. But the platys kind of chase everyone.
Also, what should I do about Packy? I tried posting a thread to the "Unhealthy fish" section but I think since I added links and pictures it will take awhile for it to be approved. If you see it please check it out. I need help ASAP never dealt with an injured fish before.
I think i'm going to go ahead and do this plan if I don't hear from anyone soon...
Anyways, he's got a pretty narly cut into his body before his anal fin, like a cm big like right after his stomach... and a tiny nick before his dorsal fin. I'm thinking of moving him to a hospital tank and then treat him with aquarium salt and melafix? Do hospital aquariums need a filter? Or will that take out the medicine? I know I need a heater and thermometer... How long should I treat him for and will he be okay? The cut is not too bad... or maybe it is... but I worry. He was pretty freaked out last night but he is swimming around and eating like normal today. I just don't want him to get any infections. Will the cut heal normally or will he be disfigured?
I'm worried about the fish bullying each other... But I would hate to have to take them back.
Also, about my platy Winston will his fins heal on their own with regular water changes or does he need to be treated to? I've never had to deal with this before and I'm at a loss... I thought I picked good fish or I have no idea what is going on... Help would be appreciated.