I was told my 75 gallon was to small for a retic and a hystrix together so what could i keep as tank mates. I had a 55 long with 2 retics in it for almost 6 yrs tankmates were figure 8 puffer green spotted puffer and a black ghost knife fish with no problems.All i had as filtratiion was 2 biowheel filters 350. i have a 75 gallon with a ehiem 2128 thermofilter and a jebo 250 external canister filter running now on my tank please help,