The temperature of the big tank will probably be a bit too high for the shrimps but you may be alright with just the fish (I don't know about the fish you have requirements) so you can carry on at that for now. If you are certain the tank is cycled though I suppose it would be easier to reduce the temperature first then the fish can go straight from one tank to the other without having to float it in a tub to adjust him to the different temperature.
Go for it, it is a big day when the occupants start going in...........
so other than PH i've gotten the tanks pretty much the same conditions. im thinking my tank is now cycled enough to take out the prawn & introduce Tyrone? oh and the tanks starting to grow algae on one of the plants im feeling the need to tackle before it gets too bad? but the plus note is the dwarf hair grass i got is already expanding.
ph dropping is part of the nitrogen cycle. That means the bacteria is doing it's thing. A water change with higher pH water is necessary now to avoid the cycle stalling.
The prawn growing fur is also normal, as it is decomposing, and fungi are starting to break it down.
Let the biofilm grow as that will be part of the shrimp's diet once you add some in. If it's hindering your view, scrape it off the front glass only, but don't syphon it out. The dislodged biofilm from the front glass will settle somewhere else in the tank.
Its good to hear that the fur growing on the shrimp is 'normal', I may leave them in until thursdays usual maintenance day then.
Todays readings are as before nitrate 25, ammonia and nitrite 0! I could get someone to get me some duckweek from the lake but I remember how hard it was to get rid of it before, so am a bit reluctant to go that route, but it should bring the nitrates down a bit???
You should leave the biofilm in the tank, the shrimps will thoroughly enjoy that when they get into that tank.
As you are aiming for TDS150 and the tank is near that now at 147 you just make the new water up to near as you can TDS150 and if you keep topping up with pure RO water between changes this would be the normal routine from now.
Getting a new TDS meter was the right thing to do as they are cheap enough and hopefully it will be more accurate? As someone said before, you can get a rough idea of whether the TDS reading is right by doing a GH test as using RO water and remineraliser those figures should be related. Probably best to test some mineralised water before you put it in the tank though!
Good that you haven't lost any more shrimps, hopefully that continues and all should be straight forward now.