Regarding filtration it depends on whether your pump pulls the water from your tank and pushes it through the filter left to right or if it pulls water through the filter right to left and pushes it back into the tank.
However, I would suggest foam first thing water goes through as mechanical which can be cleaned easily and as often as required, then the alpha grog as bacterial, then the zeolite, then a smaller amount of chips and the carbon.
As for water, have you tested the quality of the pond?
For your tank you might be better adding water from the pond to the tank if it is low enough in nitrates and then topping up the pond with the reserved tap water. Just a thought.
Thanks for the suggestion! I've already rearrange tank filtration as you suggest and all of the guys inside feeling better!

I add bio rings in alpha grog chamber, reduce the coral chips into small amount (only in the bottom part of zeolite chamber) also adding peat moss (the small white bundle in the top zeolite chamber) to reduce water hardness and reduce the PH, my water quality are good now! PH around 6.5-7 and Hardness (GH?) around 150-200, This setup already running almost 2 week and the guys inside seems healthy.
As for the water in my pond, the quality also good(almost same amount as my tank except GH around 50-150), but the coloration is very brown (like water in the brackish river) so i decide not to use this one since I cannot see fishes in my tank if I use this water.
Last week, I also tried once more to pet another silver and he's swimming and eating well, all of his fins seems flaring almost all the time I see him up until now.
But my questions are, since he's still juvenile (around 6") should I feed until he's stop eating? or should I give him some exact amount everytime i feed? (5-6 meal worms every feeding time)Because this dude having big appetite for such a size! He's eating like there's no tomorrow, on my first attempt to feed, I keep giving him meal worms until his stomach bulky (around 14-15MW) ... but I'am afraid I might did wrong at that time, then I give him around 5-6 meal worms every feed time, or 2-3 crickets up until now.
Also when I feed him, I give MW that white/pale one that just shed shell and sometimes baby crickets (young cricket that still have no wings) that I remove the legs (since I'am afraid this sharp and pointy cricket legs and can damage aro stomach).
I feed MW with vegetable and shrimp pellets, I've read the articles that if you feed MW with vegetable such as carrot will transfer the vitamin A to the fish as well, Is it true?
My last question, are freshwater shrimp good for aro compared to MW/Cricket?
If it's having good nutrients than MW/Cricket then I would consider add it to his food list (I might give it twice/thrice a week).
Sorry for being talk active in here ? and thanks a lot! ?
PS : I also add some hardy plants with low CO2 needs (Swords, Anubias, Vallisneria and Frogbit) Here some photos and my current tank...



