Resident Aquarium Nerd
Join Date: Apr 2004
Location: Murfreesboro, TN
Melafix acts more as a preventative, not a cure. I do know that it kills certain bacteria but the list is limited. There's a reason that the same company also makes an actual medication. Either way, if an infection has progressed that far, you need to skip the Melafix and move on to stronger things.
A 100-watt heater seems a little big for a 5-gallon but you should have a thermometer, anyways, right? Just see what the temperature is. If it's good, keep the heater. If it's off, get a new one. My favorite heaters are Stealth heaters (by Marineland). As far as filters go, you don't have a lot of selections for a 5-gallon, sadly! Eclipse and Azoo make some nice small filters, I believe. There is also a Whisper filter designed for small tanks but it's a bit strong for some bettas.
It doesn't sound like your tank is cycled. And even if it was, it probably isn't now that the filter is broken. Get your water tested, you're probably experiencing spikes of some kind. Keep up on water changes, too.
Even with the right medications you won't be able to fight this infection unless you correct the other problems in the tank. Improper temperature, lack of filtration, ammonia spikes, etc. can all make fish susceptible to infections.
Good luck and keep us updated!
"We weep for a bird's cry, but not for a fish's blood. Blessed are those with a voice."
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