I just wanted to agree with everyone else. But as long as they are babies
the 20 should be fine for now but I'd definitely get in the habit of doing a
regular water change. To many its a shock how much water change you
should be doing, as most pet stores will only tell you like 25% a month but
that isnt really a good idea. Weekly is best if you can pull it off. Many do
50% weekly, 25% is probably fine for the average tank. You might be
good with biweekly also but I'd not recommend any less than every two
weeks at 25% minimum. Some with overstocked tanks actually do 2-3
water changes a week, and ~50% each time! I dont have the time to pull
of more than 1 wc per week but I can usually keep up with once a week
and I'm very lazy.
I often say the single best thing you can do for your fish is a regular
weekly water change. Just make sure you match the temps close enough
and use a good water conditioner like Seachem Prime.
BTW, have you heard of a python? Many newer aquarists dont do
waterchanges since they are a PITA. But they also dont know about the
Python, which attaches to a nearby sink and will drain and fill your tank via
a hose and you dont have to carry buckets or anything like that.
And also, I hope you have plans for a good sized tank! If you planned on
keeping all those same fish together in one tank you going to need a 6
footer probably (125-135g minimum).
Good luck! And dont hesitate to ask anything on the forums if you have
more Q's.
