Guess you're not the only busy one! (There haven't been a lot of responses in the diseases section lately.)
I believe your septicemia is indeed your fault (sorry...) - but it is typically a result from too much ammonia (I'm reading at least...)
From this website:
http://www.fishpalace.org/Disease.html#Septicemia
Physical Signs: Distinct bright red streaks on fins (caused by vascular inflammation due to systemic/bloodborne bacterial infection) and occasionally patchy red discoloration on the flanks of the body.
Behavioral Signs: Depends on severity of condition. If due to ammonia, may show in conjunction with hyperventilation (fast breathing) and gasping at the surface, erratic swimming, etc.
Potential Treatment: Broad spectrum antibiotic. Can resolve spontaneously in some fish if source of water quality problem is removed.
Other Notes: Check water quality, especially if fish exhibiting other signs of ammonia poisoning (gasping at surface). Regular water changes and measuring of ammonia/nitrite (especially if relatively new tank) are a must. In FW, commonly seen in goldfish due to their naturally high ammonia output. In SW, often seen in tangs due to their inability to tolerate sudden water quality changes and susceptibility to shock.
I would say DEFINITELY do some water changes, even every day to get that ammonia/nitrite level down. Did you test the water and find that the levels are high?
I never really have put any medication in my tanks other than Ich medication, so I guess you'll just have to either try it through frequent water changes (and maybe the addition of some salt to the water (even freshwater fish are okay with a certain level, typically 2 TBSP per 10G "as a general tonic and stress reducer" my API Aquarium Salt says -- as salt often helps with curing of simple problems -- someone else can back me up on this.)
Good luck - hope your little guy/gal makes it.
Help with treatment of Septicemia?? 
