First rule of fishie ownership - DO NOT listen to petco or petsmart or any other petshop
! I also learned that one the hard way and killed a few fish before finding out i need water conditioner
Moving on - so you have the 2.5 divided with 2 fish. One new one and the one with fin rot, correct? The problem with dividing the 2.5 is not really the small size but has more to do with the ammonia buildup in the water from the 2 fish.
If lack of money is an issue, a cheap solution is to keep one fish alone in the 2.5 and move the other to one of those sterelite storage bins. A 5 gallon tank is like $15 but you can get a 5 gallon storage bin for like $5. Granted, it's not the fanciest thing in the world to have on display but it's cheap and you can always get a real tank at a later date.
I upgraded it to this, which is about 20 gallons or so. I think the bin was on sale for $7.
However, if you would rather go with an actual tank, walmart should have the 1 gallon hawkeye corner tank for about $10. It was a light, and undergravel filter thing with an airstone and pump. I removed that - took up too much room.
For cheap heaters - try searching amazon or ebay. I got most of my 25 watt heaters for about $10 off ebay
. It may take a few days or so but you will eventually find some for a good price.
As for bettafix- yay and nay. Some people say its a wonder drug, others say it killed their betta. It has a tea tree oil in it that many people say will harm their breathing organ. Personally, I think if you do not over dose, you should be OK. I have used it before as it was the only thing I could find. I think alot of the "bad" was either that the owners did not follow directions OR the fish was in worse shape then just fin rot. Petco dosen't sell any useful meds like Furan 2 or Tetracycline.
If he ONLY
has fin rot - that is easy to fix. Clean, warm water is usually all that is needed. Some people like to add in 1 teaspoon of aquarium salt per gallon as well. DO not use salt for more then 10-14 days and do daily 100% water changes. Basic fin rot does not need to be treated with medication - unless it is fast moving or about to attack the body of the fish.
However for the popeye - Epsom salt is probably best. It will help draw out the fluid by the eye whereas AQ salt will help him retain it. The treatment is the same - 1 teaspoon per gallon with 100% daily water changes. However, unlike AQ salt - Epsom can be used long term.
ERYTHROMYCIN should work for both popeye and fin rot
API Pro Series; ERYTHROMYCIN -$8.59 Jump to Shopping Cart
*10 powder packets for 10 gallons each
*Premium aerobic gram positive bacterial treatment for bacterium such as Streptococcus infections in fish
*For many eye infections
*Some causes of pop-eye
*Bacterial gill disease