I give my a fish a day off food once a week. It doesn't hurt them at all. I also tend to feed at different times rather than have a set regime as in the wild they won't get a dinner bell at 1100 and 1700. I don't think its necessary to fast them as long as they're not overfed in the first place. hth
I would put it in now set at low temp, give it 30mns and switch on. You'll see in the morning if theres any major issue. When i mentioned adjustment i was looking at reaching amid range temp from aheater so i think you'll be fine.
Regarding bacterial, no fin clamping or sitting near the bottom?
try a search on interpet internal bacteria no9 may give you some clues.
Fish produce ammoia all the time. Through breathing and their waste. Hence why we need filters. As regards to production while stressed i don't think that this is the case. It would seem the other way round.
Why not ask the question with a new post in the cold water section. We have some excelent advisors there. hth
Simple as. Its something i have done for years, 2 weeks ago actually as well.
The main point is to add as much original tank water to the new tank as possible, as filters don't liike temp change,new water etc Specifically untreated water.
I would use all the media from your internals to fill the external. You can fit sponge into all the areas of the new filter and then in a few weeks take out the sponge and add ceramics carbon or whatever you see fit. hth
Good water tight insulation. Sorr don't want to talk to you like a child but if i said hey its ok to put your hands in the water and something went wrong... The fish if there was something wrong with the wiring may be ok due to lack of earthing. I would hope that if a cable frayed and came in to contact with the water it would shrt the system or blow the fuse.
Maybe you should try a pol an how many people put there hands in with electical equipment running. If they're honest i know what the result will be.
Don't know about you Jon but I don't think its an age thing, i still ride bmx. But when we grew up there were no mobile phones internet etc so its just another thing that will sell to the techno generation and make money thro' advertising perhaps?
Firstly regarding the heater that will support your tank no probs. I'd probably set it at about 20 degrees C.
Secondary, the red streaking in the fins could well be caused by a bacterial infection. This could and i do say could have been caused by the drop in water temps. i would advise putting in the heater and slowly raising the temp. Don't switch the heater on until its been in the tank for at least half an hour and then set it a degree or two above present tank temp. Then check tomorrow and adjust again until you reach the desired temp. Could you try to post some pics of the red streaking, if not poss pls can you describe his general behaviour.