How awkward is it when it's time for a proper clean out, gravel 'n all?
Looks awesome, I just foresee niggles.
take the guppy back, did the fish shop tell you these can go together?
stick some dainos, neon tetra, platys in there.
or get 3 fighters - 1 male and 2 female (not 2 males)
Keeping a tank clean is hard, no doubt about it, water changes must be made on time and filters cleaned and any food which makes it way into the bottom crevices must be cleared out.
Full on tank cleansing imo should be done every 6 months, whether you remove the fish or not is up to you but keep in mind fish get stressed and they will die from it.
A clean fish tank is amazing to look at if kept clean but you have to be dedicated to it.
I know all this - I have 3 tanks of my own. I'm just wondering how awkward it is cleaning a closed-top tank like the OP's.
I agree the guppies will have trouble off the fighter - That is if ANY of the fish actually survive. Fish IN cycling sucks. Should have fishless cycled with ammonia before adding fish. All that bio load into a brand new tank on the second day is going to end up with ammonia and nitrite spikes. At the very least the fish will be ill / distressed, at worst dead. Unless you are doing 50% water changes every 4 hours.
Good luck.