Tank size?

[Ursi]

When I bought my tank, I'm positive it said it was 260litres (69g) but when I put in the measurements on aqadvisor, it says its 40 gallons.. I'm really confused, do I go by the measurements? It's 46 inches long, 14 inches depth & height. Seems a very silly mistake to make, but I'm concerned for one I'm overstocked, and two that in the past I've been using too much meds etc, even fertilisers.

 

[Ursi]

39 us gallons, 151.8litres.. Wow I'm am idiot!

So I'm currently treating for ich, but once it's clear I need to sort my stock out. I'm 127% according to aqadvisor. Can anyone advise what's best to do?

Running an interpet pf3 HOB and a aqua manta EFX200 canister in the tank, flora base substrate, live plants, 2 long air stones.

My stock:

2 bristle nose plecos
2 zebra loaches
1 zodiac loach
5 corys

4 balloon mollies
6 mollies
2 platys
2 swordtails

6 black tetras
7 neon tetras
2 ember tetras

1 angelfish

Note: I do have a spare 65 litre tank that is not set up. I was wondering whether I could put some in that tank and move one filter over, the HOB until I have at least cured the ich, and then rethink what I'm going to do.

Can anyone advise? My water parameters always read 0/0/5 7.5

Thanks