Sorry also didn't see your last thread. I am going to give you acclimation instructions that are important when you do 100% water changes. You need to do it because you don't want to shock them with drastic temperature difference. I am not sure if you do full water changes for your tanks:) You do 3 times for 1.5 and 2 times for 2.5 gall , is it full water changes or you do partials? For 1.5 gall it really difficult to establish cycling and better just to do 2-50% and 1-100% water change a week. The same for 2.5 gall. But if you trying to cycle it i want to give you very helpful link from this forum. Let me know;)
There are many ways to do a water change and acclimate (reintroduce) your fish back into the tank. Here is a few variations that's pretty simple:
Note the temperature of the water.
Using a plastic cup, scoop him, along with some of his water, into the cup.
Clean out the tank. Refill with water at the SAME temp. Be sure to add the correct amount of water conditioner.
Float his cup in the tank for about 15 min. (Study during this time. If he sits longer, it's OK.)
Add a SMALL amount of NEW water to the cup. (Several tablespoons, or about 1.5 ounces.)
Let his cup float for about 10 min. (Study during this time. If he sits longer, it's OK.)
If the cup starts to fill too much, remove a SMALL amount of water from the cup. Discard it.
Repeat steps 5-7, until about an hour has passed. (If he sits longer because you're studying, that's OK.)
Gently release him into the tank.
Big water changes should have careful acclimation like this:
To do a water change, use a little cup like a plastic solo cup - this cup must be only for him and have never been used with soap or other chems. Scoop him up in this cup (keep him in the cup about 1/4 full of water - it doesn't need to be much because he won't be in it for long) and leave him in the cup while you change his water. To do the 50% use a turkey baster - dedicated only to him that has never seen soap or chems - and drag it through the gravel and try to suck as much of the poop out as possible, in addition to 50% of the water. Use a thermometer under the running tap to get it to be the same temp as the water that is normally in his tank. When the thermometer says the flowing tap is the right temp, fill back up his tank. At this point, add the conditioner (dose for how much water you change - if you change half the water you add half gallon worth of conditioner, If you do a 100% water change dose for the full gallon change). Float his plastic cup with him in it in the new water. Slowly add a couple tablespoons of the new water into his cup every 10 minutes for at least an hour. Finally, dump him in gently but try to get as little of the old cup water back into the tank as possible. When you do the weekly 100% you will do mostly the same thing except empty his tank fully and rinse everything in it very well under warm water but never use soaps or chemicals. Once it's fully cleaned/rinsed you can refill it and repeat the cup/acclimate phase.
When I change the water I put him in the cup I got him in. Then I take everything out of the tank, rinse everything with warm tap water. Then I put everything back in the tank, fill it with DECHLORINATED water. Then turn the heater on. When the tank water is the same as the cup water I take the dirty cup water out and a little at a time and put clean tank water in the cup. After that I put the cup in the tank and he swims out.