Our two bettas, Feathers II and Rock N Roll, have been living in 1 gallon bowls with sub-optimal temperature control while I've been awaiting the arrival of our 2.5 gallon tanks and heaters. The tanks are unfiltered (part of our purpose in keeping fish is to teach our kids about responsibility so we are committed to performing water changes as often as necessary) but I did spring for the Hydor THEO adjustable heaters.
Now that everything is here, I've realized I don't quite know what to do next. I have two major questions:
1) How should I acclimate the fish to their new environments? Their current bowls are at room temperature (approx 72 degrees F). Should I let the tank water reach the same temp, transfer them in, and then gradually raise the temp to around 78? Or is it better to bring the tank water to 78 then acclimate them as one would a new betta fresh from the supplier?
2) How often should we do water changes in the 2.5 gallon tanks and at what % (taking into account that they do not have filters)? We had been doing twice weekly 50% changes in the 1 gallon, but more recently had been doing 3x weekly to daily (both fish developed minor health issues) 50%-100% water changes.
I should add that both fish are currently healthy and active but both HATE being moved - Rock N Roll practically died from stress during one recent move and Feathers II avoids the net like the plague and it usually takes me multiple attempts spaced out over the course of 30 minutes to an hour to get her into a cup so transfer and water changing strategies that involve as little movement as possible will probably benefit both of these fish.
TIA for your guidance. I have learned so much here in the past several weeks and am excited to finally feel like I am being a responsible fish owner and providing a more optimal environment for our boys!