Ok here goes, I'm sure to babble a lot but mixed in they'll be some decent info, from my experience at least
Firstly I figured since my Goliaths come from the congo, and its located on the equator hot is good ... the congo also isnt like the amazon, where theres a rainy and dry season, its fed from both the southern and northern hemispheres, thus its water level and params stay virtually the same year round, thus the current is always there .... these fish prey on other fish that get caught in the strong current and cant get out easily, making them easy for the tiger to attack .... I keep my tank at 82, but would have it at 86 if I thought my cats could handle it, dont want to push too hard though
In the beginning when I got my tigers they fought a lot and slowly developed white patchy areas and didnt know why ... turned out it was lack of enough current cause when i added a powerhead it went away, then the growth started, so this is the main reason .... I think the strong current also helps them to relax, kinda forces them to stay put rather than racing around the tank and I think this combined with bubbles helps them to spazz or be spooked less ... I have noticed that by dropping pellets in the current they love to swim in, grab it, then swim out, but they have no problem scooping them off the bottom either
I have about 3500 gph coming from the return, and 4, 3250 gph power heads, mostly towards the top causing lots of surface agitation, and 1 big bubbler with a 6 line outlet all with discs to the sump ... along with 2 regular bubblers that I have ziptied to the return line for a bubbly powerhead look ... I think the bubbles create a lot of noise and yes to break up line of sight so they freak out less ... if the fish gets used to a very active tank I've seen they are less likely to be spooked, which has been my biggest proboem with ATF's ... in all honesty though all the bubblers I have I think are somewhat unnecessary, they are more there to make sure the cats get enough oxygen in the warmer water, but I'm sure it benefits the tigers as well
I've noticed time and time again as I add powerheads the tigers seem to be more calm and feed more ... its just gotten to the point that adding more actually will reduce the current in my tank because the powerheads begin fighting eachother .... the front of the tank has the most current from the return and powerheads, while the back of the tank is more a slow pull of the water being dragged to the powerheads so the front moves right to left and fast and the back of the tank from left to right... the tigers attack in the current, then chill in the back ... I also stumbled on something kind of neat .... my tank is unlevel thus I have a powerhead pushing water into the left overflow ... this powerhead is attached to the left of the middle overflow at the surface and blows to the left overflow thus it is fighting the left to right current in the back ... this creates sort of a stagnant area at the left top of the tank as the return line flow in the front meets this push because they are fighting eachother and meet at the far left of the tank .... this allows for floating food to not get sucked up into the overflow immediatly, which has always been why I shied away from floating pellets, and is where a lot of surface feeding takes place .... this also creates a downward water movement thus supplying the cats with a strong breeze ... most of the time I dont see their gills moving, they just have their mouth open a little and the water forcefeeds over their gills much like a shark swimming to breath
Hopefully I answered at least a couple of your questions with my rambling
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