I have been planning on upgrading my current 72 gallon loach tank for a while, and finally - my upgrade arrived! 225 gallon with 72X36 inches footprint. I currently have 7 clown loaches, 9 torpedo barbs, bushinose plecos and 1 weather loach. The plan is to move clown loaches, barbs and some plecos to new tank and keep weather loach with 7 new friends (who are currently in Q-tank) in cooler 72 gallon tank.
225 gallon:
Substrate: mostly sand with fluorite gravel areas for plants (sand is either pool filter sand or eco complete sunset gold)
Décor: driftwood, rocks
Plants(wishful thinking): anubias, ferns, mother sword, vals
Filtration: internal wet/dry + Eheim 3e(2078); Eheim has been running on my existing tank for over a month
Additional flow: Koralia 1400/1500 x 2 + 2 Marineland Maxi jet 295
Planning to set up all Eheim spraybar and all powerheads on the left side for one direction flow.
Fish move date will depend on how quickly new fish tank cycles

72 gallon:
Keep second Eheim + Emperor HOB running as is
Replace current fluorite gravel with sand (leave some gravel areas for plants)
Keep Marineland 295 powerhead
Once clown loaches moved to new home, slowly lower temperature to acclimate existing weather loach and couple plecos
Move new weather loaches from Q-tank (currently keep at 74F similar to the tank they arrived from)
Select dither fish for weather loach tank
I am very new to sand as substrate, so any advice on sand selection is appreciated. I like the look of sunset gold eco complete, but not sure if I can achieve the same look with the pool sand. I am going to have a "field trip" to check pool sand out. I've tried silica sand before, but it turned very gray unattractive color.
Also, new weather loaches have been in Q-tank for almost a week and they appear to be very active, hungry and silly. Would you recommend treating them with anything? Or should I just keep them with no medication and observe? I have medicated flakes from AngelsPlus available.

I appreciate any comments, suggestions or advice... Thanks in advance for your help!
