I'm going out of town later today and am taking my crowntail betta to a friend for "fishsitting" while I'm gone. I need to figure out what to do before we leave.
The fish is in a 2 gallon (I think) aquarium with a filter and light. I have one small live plant and one betta in the tank--we've had the fish about three months. I don't have a heater but I do have a thermometer; the water is generally between 78 and 83 degrees. I've been having some problems with algae lately. I confess, I let the tank go too long without water changes a few times over the past several weeks (although the algae problem has been persistent even with weekly partial water changes). I have the light on a timer, about 4 hours in the morning and 4 or 5 hours in the evening. The tank is not in direct sunlight.
Three days ago I did a big water change, probably 60%. I scrubbed the algae from the tank sides with a new algae scrubber and added a couple of drops of Tetra Algae Control with the new water. I left the filter out for a few hours.
Yesterday I thought it seemed like the fish's fins were shorter than they used to be, but I wasn't sure. This morning I happened to see a picture from when we first got the fish, and they definitely are. There's a tiny bit of whiteness around the edges of some of the fins. I honestly don't know if this started before or after I put the anti-algae chemical in.
Last night I checked ammonia and nitrates. Ammonia was at zero, nitrates between 0 and 5ppm. I don't have any other test kits.
I just did another big water change to try to get rid of the chemical, in case that's what is causing this. I won't use it again. But now I need to figure out what to do and what to tell my friend to do to help the fish get better. Here are fish medications/treatments that I happen to have in the house (and I don't think I'll have time to get to the store before we leave):
API Fungus Cure
Should I use any of these? Whatever I do, I'm going to need to tell my friend to continue while I'm gone. Help!