Will there not be an issue with the filter media not having water flow through it for two and a half hrs? Surely bacteria will die in still water?
This used to be advocated, but no longer. There are studies suggesting that in the absence of oxygen, aerobic nitrifying bacteria can change their metabolisms in more than one way; cells may go into a state of rest, and some are even believed to be able to convert from nitrifying to denitrifying bacteria. My canisters are turned off during water changes, which admittedly is only perhaps 30-40 minutes, but there have also been power outages.
But having said that, if this were me, I wold never move a filter without rinsing it under the tap before setting it up again. This will deal with any sludge, and the live nitrifying bacteria stuck on the media will survive in most cases.
Bacteria are not the timid delicate creatures we used to assume they are. Read more here:
http
/www.practicalfishkeeping.co.uk/content.php?sid=4780&utm_source=PFK_newsletter&utm_medium=email&utm_campaign=February_10_2012&utm_term=Think_you_know_filter_bacteria?_Dream_on…&utm_content=html
Side note.. Is maintaining a 400l hard work? I know the higher the volume the better for stability of water chemistry etc. How do you do weekly maintenence on that behemoth?
Water changes are essential to a healthy aquarium, if it contains fish, and the more fish (in terms of numbers and size), the more water needs changing. I do 50-60% of each of my tanks every week, from a 10g up to the 115g/435 litres. This is only "easy" with a "Python" water changer. This connects to the tap and there is a valve so you can either drain or fill the tank.
Oh also.. Forgotten how to assess max stocking capacity too. My tank has been intentionally under stocked as I'm away so much. Now I'm moving it with me though I want to get it back to max capacity. Can you guys suggest how many I can stock these current groups up to please?
13x panda cory
7x praecox rainbow (love these fish!!)
8x black ruby barb
1x snakeskin barb (chums around with rubies so wouldn't want more snakeskin)
1x glowlight tetra (poor thing the last survivor of his kin. Been delaying getting him friends due to minimising bioload in my absence)
If you decide not to continue with glowlights, I would just leave the last one. But if you want this species, I would suggest a group of 10-15 for a 55g.
You could add a few more of the rainbows and black ruby barbs. I would suggest increasing the groups to roughly 10-12 if you want, or they could stay as they are. I probably wouldn't add to the pandas at 13 now.
Byron.