Altcoin will usually increase when Bitcoin rises, and that is true, and now is the right time to buy altcoins because altcoin is now cheap, and if when the altcoin rises, we will benefit, so it is true now is the time to invest funds we are in altcoin.
sometimes if bitcoin price rises , altcoin could down.if we see in few days ago when bitcoin price rise some altcoin down because some investors want to to convert altcoin to bitcoin.