Penny stocks run a much higher risk on running your investment into the ground.
I like POT, SIMO, NMM, EXPD for day trading.
I would not "invest" in these current times, it is way too volatile and it'd be foolish to make bets as to where and when we will reach a bottom.
Either learn or find a truthful broker to daytrade for you or stick to bonds/cash short term and be ready to load the truck with cheap stocks once we reach a bottom and are on our way up.
You run too much risk to try and gauge the bottom, you're better off waiting on a clear indication of recovery and then invest, you might loose a few potential paper gains but in the long run you'll have been exposed to less risk.
We're in a deflation cycle, this means your liquidity is fine under your matress for the next months.