Got a lot of Fancy Guppies (what to do)???

Hello all,

Shortly I will be breaking down my 29 gal tank with almost 50 or so fancy guppies and their babies... They have been breeding with no special maintenance or care for about 4 years. Yeah it was awesome to have an endless supply of these beautiful fish in my tank but I am going to try my hand at a Low Light, Low tech, no Co2 planted tank.

I have a small 5 gallon tank which I intend on temporarily housing these fish while I break down the current tank and replace with a new 29 gallon planted tank.

My question is 2 fold.

1. I will be hosing these guppies in a much smaller tank while I get the new tank planted, cycled and ready to go.. This may be almost a month before it is ready. So do you see any specific issues with having all of them in such a small tank? I will have it filtered quite well and plenty aerated. But don't want to have the fish suffer too much stress... I already have the hang on back filter running on the current tank to get the beneficial bacteria set up so when the transfer is done the temp tank will not have cycling issues.

2. When my planted tank is ready will I have an problem with overpopulation if the guppies continue to breed in the tank? I started with 4 and now have more than 50 of various ages and genders.. I'd hate it if the sheer eventual volume of these fish would give me problems. I don't intend on filling the new tank right away with all the fish. Just a few at a time as not to shock the new ecosystem..

So... am I doing myself a disservice trying to keep these guys and gals? should I consider giving them away to a Local Fish Store and start fresh when I am ready? They are all healthy and have no sign of disease..

I would like to keep them but the time has come to upgrade.

Any suggestions? Any tips?