Jakob;1771926; said:
For how long could i have 3x 4" Dovii' in a 40g L 100cm W30 cm H 47cm.?
What about one?
Could i have a 5" T. Buttikoferi with a same sized Dovii?
Any other tankmates ideas for a 100g.
They're already too big for the 40g L.
One would be ok for maybe six months, tops.
You could have the butti with the dovii, if you want it to die. If you were to mix all the dovii and the butti, (depending on the sex of the dovii) the dovii, if all male especially, would kill the butti first and then the dominant one would kill the other two.
You could do a tank mate in a 100g, perhaps a Caqueta Umbriferous, for a very short period of time. IMHO it wouldn't be worth the hassle that you would have to undertake in moving them in a short period of time anyway.
Of course, you can always keep fish in a less than adequate size aquarium if you keep the temp low and feed them about once a month. That would decrease metabolism and slow growth rate to a point.
Now that I've answered your questions, let me give you my opinion. If you plan on keeping all the dovii, get a 300+g aquarium, set it up right, and leave them in there for life. Do things right the first time. Take your time or waste it twice, I always say.