So the rent pool was mostly  terrible.      

He even plumbed in a 2" drain and a 1/2" water supply line into the aquarium cabinet for changing water in the aquarium. 

It has rural water and they are not allowing any new connections to sewer so what are my septic options?

If i put 4 water heaters in a 4-plex, then the tenants can pay for the cost of heating the water, but I have to pay for 4 heaters and worry about capex on 4 heaters.

My question is, does it make sense to put up a pool cage over the pool? 

My question is am I limiting my rental pool too much by not having a bathtub?

First time in the pool here.

In 2017 our goal is to obtain one SFH rental property to test the waters.

Other than that, you still need to include insurance (interior coverage), power/water, property tax, mortagage. 

I haven't seen any posts about this here on BP--- I've been told by the City of Chicago plumbing inspector that I need to upgrade water service from the water main in the street to the house to 1.5" at my rehab.