Hi, I am new to the forums my baby Bleu is in need of help ever since today, I am going to explain what happened there is a picture below of the tank I have. The tank is a home to my two male Betta's Bleu & Ren. I believe I had both of them for maybe a month or less, I am new to Betta's I own a community tank downstairs in my house, I also have had turtles in the past [Gave Shrek away to my mom's friend since she has 4 turtles and a huge tank.] So I am new to raising Betta's I have done all my research on them before I got these lovely fellas but today I am having a problem.
About Their Tank: They live in the same tank, the tank has a divider with small holes in it, my betta cannot see each other this is because the holes are pretty small & there are no signs of aggression & no fighting, no ramming the divider, no flaring. The tank is I believe bigger then a 1/2 Gallon almost 2 gallons, the reason why I have a small tank is because Pet Habitat is horrible with fish tanks, [The one at the mall] they pretty much have nothing all their tanks are smaller then 2 gallons. I got my fish from a great Pet Store, we have known them for years & their kid is my friend so well yeah, they have a lot of amazing Aquariums & stocked up with everything but because I got my small blue tank before I got my new fish I couldn't get a new one. Now off to what happened.... [The tank also has a lid, no light though, no heater, no filter.]
I have never cleaned their tank for maybe a month or 3 - 5 weeks or longer, this is due to the fact that my parents couldn't pick me up Water Conditioner to keep the water safe so I wasn't able to change it :( I would of changed it on the right time and everything, but this didn't affect my fish they were very active & would never get scared if my hand came up to the tank or anything, they would swim around 24/7 and would be pretty hyper.
Monday The Next day: So today my mom got me Nutrafin Waste Control, Nutrafin Aqua Plus, Nutrafin Cycle. I took my Betta fish & because the tank was small I tried to corner my halfmoon, he is pretty fast so I don't know if I may of crushed his fins or something happened when I went to catch him I got him and then he was stuck in the next I pushed the net down [Not crushing him] And he was able to get into the cup, he was fine and was swimming around. Then I went to go get Ren my crowntail I put him in the cup, but it took me under 30 seconds to catch him. Ren was easier to catch he also got stuck in the net and I had to push him down [Again not crushing him, I can't really explain it.]
After I rinsed out the gravel, fake plant, the tanks top & the tank. [I didn't wash my tank with soap because people are saying it can kill the fish if there is even a little bit, so I didn't tank the risk.] I filled the water up with warm water, perfect temperature but I didn't know I have to wait a day or so [This is my first time cleaning my Betta's tank.] I put my Betta in and I forgot to add Nutrafin Aqua Plus, I added that but I think I put WAY to much I put a full small 5mL in and then I added like 4 or more drops in [Didn't know, again first time cleaning their tank D:] So later on I came to feed my Betta's a treat, when I went Bleu had some black stuff on his fins it's like when a fire burns a log it goes black, his fin was black on the bottom of his Anal fin, just like a piece of it is black it looks ripped up & looks like going to fall off. When I was cleaning his tank I saw 2 small holes in his Dorsal Fin & maybe another one some place else. On Bleu's Canudals fin there is a Triangle Slit cut, it's like a cut in a shape of a triangle that is sideways.
On Bleu's fin they look ripped up, I don't think it's fin rot I can't tell he is a common blue halfmoon with red, it's hard to tell but it looks like every wear in his fins it's cut & short cuts not perfect fins.
He is still active but he is pretty slow today, he isn't being aggressive he's just swimming around slowly and going to the bottom of his tank putting his head down looking like he's searching for something.
My crowntail Ren is perfectly fine, but ever since I changed the water he's been flaring & being aggressive but not to the divider, his fins are fine, he likes going to his fake plant it has never ripped his fin since he swims gently towards it. When I turn my lights off their both less active, I am really worried about Bleu I honestly don't want him to die.
Ren has the plant, because when I first got them they were both so small, but because Bleu is a halfmoon and has longer fins he didn't get the fake plants, Ren was pretty tiny when I got him now he's bigger and doesn't really go to his plant often, when he does he just sits in it then swims away happily.
Ren is starting to go to the bottom of his tank and just sit their and watch, I am really worried about my Halfmoon is this because of the net? Fish rot, to much Nutrafin Aqua plus?
Should I clean the Betta tank again? Should I add Nutrafin Waste Control Or Nutrafin Cycle?!?!?! I did a 100% water change today, it's my first time changing the water and I looked on Google and I saw people putting for small tanks do 100% water change.
There is no fuzzy white stuff or anything, my fish never poo there is no poo in the tank at all, because I didn't clean my tank weeks ago I was expecting to be poo in the tank, but when I rinsed everything out there was no poo in the tank, I don't know if their digesting they have a diet. I feed them Flakes, Blood worms, Pellets..etc [I don't feed everything together, I feed them a proper diet I am just telling you which foods I have.]
Please help, I don't want Bleu to die he's just been sitting in the same spot and watching, sometimes he will come up and swim around but then just swim down and just stare at something. [He doesn't stare at the divider.] Please help, what should I do?!
[Updated version, easier to read & understand.]