well it's been about 2 and a half months since i started this project, it seems a lot longer. but here's the result
i'm going to add a big plant, possibly on a log or something, on the left hand side
i let the pond sealant dry for a full 7 days (with a fan blowing on it). subsequent pH tests show no change from fresh tapwater. so i set the tank up where i want it, filled it, added sand, and let it sit for a coupla days. then i added 4 albino cories. they seemed happy enough after a day so i transferred all the fish across from the old tank. everyone settled in fine and they all seem happy and healthy. i also moved the 2nd cannister filter to the new tank, so currently i've got 2 filters running, handy whilst the surfaces within the tank build up a nice coating of bacteria
it occurred to me, just before moving the fish in, that the clown loaches would almost certainly try to break through the mesh i put over the intake hole. i solved this problem by jamming the end of the piece of twisty wood into the hole. still room for waterflow but not enough room for big fat troublemaking clown loaches to get through
i was getting a lot of condensation inside the lid, so i cut out a large part of the rear panel to improve air flow. now no condensation. i need to add some strips of wood inside the hinged lid as gaps are allowing light to leak out
so i guess now i need to do something similar for my old tank.....